. >> one of the men are reportedly seen carrying a black backpack. stigators say this pressure cooker bomb was being held inside of a black nylon backpack, a bag that triggered their interest. photo for you to check out. taken by a man who was watching. his wife participating in the marathon. it shows what looks like a bag inside the barricades. can you see it? tritd to highlight it for you. he took the picture an hour to an hour and a half before the second explosion. it appeared to be the same bag that's outside the barricades in these whwd-tv pictures. it's been turned over to inve investigators. >> in a few hours we're going gather and pray in an interfaith service here in boston. president obama will be in attendance along with many others including mitt romney, former governor of massachusetts. cnn will bring you that service live. >> here in boston, many of the people who came here just for the marathon have not left. there is a sense of connection here now to what's going on. some of it is waiting to see what happens, if there's a discovery. b

this is shredded black backpack that the f.b.i. says contained one of the believed to be in it. come appeared to be a battery one of these online. this and liftchargeable. it is advertised as having a "very long" fox's lot in remote control cars. the device were found and measured. officials said the pressure cookers were filled and black powder. 5. this looks like wires. the explosive devices were triggered by "kitchen-type" the recovered parts include part of a circuit board, which might have been used to detonate a device. a law enforcement official said monday's bombs were probably detonated by timers. 6. another piece of a pressure cooker was found at a blast site. forensic and components of the homemade devices were container, could help manufacturer and possibly buyer. wethis is a different view of the bombing. >> pam:these pictures were taken from a nearby office building and show the chaos coming up at 5:30. we have new images to show you of what the bomb might have looked like. right now we are awaiting an >> catherine:yo

, remnants of what is a black backpack, and they think a pressure cooker, found the lid on a rooftop.his is the important piece, who did it. >> exactly. >> megyn: if they have video of a young man dropping a black bag at a second bomb site. how do they he go from this picture, who is it? >> now they go out to everybody in the area and reenact who was standing there. who might have seen, who was in the image, who was in the picture and try to piece together those individuals and say, did you see this person? and then-- >> start with the people in the hospital, nearest the bomb site. >> exactly. they're the people you know are the most likely to have seen the guy, but then, you do expand out and try to say, okay, given this description and put out in the media. this is the description of the person, their age, this is their ethnicity, this is the skin color, what they were wearing, all of these different things and this is the person we're looking for. have you seen anybody that matches this description? >> what about in today's day and age in a post 9/11 world we have things like terro

the man carrying a black backpack and the one wearing a white cap and carrying the white backpack. walking several meters apart. they were walk being towards the finish line near the place where the explosions occurred. they think the man with the white hat placed his backpack on the street where the second explosion took place. >>> search teams are picking their way through the debris after an explosion at a plant in texas. it leveled homes and businesses all around the complex. 5 to 15 people have been killed. more than 160 injud and several firefighters are missing. >> at this point, they are in the continuation mode of search and rescue. which to me, means that they are still going out, looking for survivors of the blast from last evening. >> more than 2,600 people live around the site in the town of west. the explosion burned homes all around. many are still smoking. police say more than 60 homes were damaged. many destroyed. but they've been challenged to assess the full extent of the damage because many are still burning. the plant stored ammonia. it was used to produce fert

. >> reporter: pictures of black backpacks.e surprised how many people had black backpacks that day. reddit.com had their own forum, called find boston bombers. at times, the crowd-sourced investigation turned into a witch hunt. when this missing student was wrongfully accused of being a suspect. as was this man. dubbed the blue robe guy. he told abc news he feared for his life. >> it's like david and goliath. except now, there's an army of davids out there. and, what we -- what our institutions need to do is give slingshots to all those davids. >> reporter: an army of davids, piecing together clues the fbi never told the public about. the suspected bomber's likely twitter account. apparently, he didn't like hair cuts. or even the music he may have listened to. digital details drawn together by people armed with nothing but an internet connection. and the famous tweet last night from boston police. suspect in custody. police sweeping the area. it became the second most retweeted phrase. second only to president obama's tweet on

the man carrying a black backpack and the one wearing a white cap and carrying the white backpack. the men entered the picture walking several meters apart. they were walk being towards the finish line near the place where the explosions occurred. they think the man with the white hat placed his backpack on the street where the second explosion took place. >>> search teams are picking their way through the debris after an explosion at a plant in texas. it leveled homes and businesses all around the complex. 5 to 15 people have been killed. more than 160 injured and several firefighters are missing. >> at this point, they are in the continuation me of search and rescue. which to me, means that they are still going out, looking for survivors of the blast from last evening. >> more than 2,600 people live around the site in the town of west. the explosion burned homes all around. many are still smoking. police say more than 60 homes were damaged. many destroyed. but they've been challenged to assess the full extent of the damage because many are still burning. the plant stored ammonia.

they show a pressure cooker, a shredded black backpack.lon and a half of killing power. the bombs may have been detonated by timers, according to chdh one of the bombs may be hidden in this light colors bag on the sidewalk here as you can see in these later photos here. the explosion was roughly where the bag sat. but here is the troubling take away. one former fbi official say the bombi inin ining bare the hall domestic and international terror. so investigators are no closer to naming a suspect. they're pouring over photos like these. most of the victims have been released from the hospital. here you go, right here, a pressure cooker lid, similar to this one, found on the roof across the street from the finish line. they believe that it was fa fashioned into a bomb, this is what held it all, a lid similar to this one. i want to bring in someone that really knows boston. it's a big city with a small town feel to it. this is in dorchester. it was planned just a few hours in advance. most of them heard about this through word of mouth. i'm

so who was walking in that general area with a black backpack? i think there would be a process of video elimination that brought them to these two specific people and then once they locate these possible -- and there's probably many different people they were looking at and then they look at the video of these two people and then at their reactions and then they might have more witnesses that we don't know about. they have isolated them. they are armed and dangerous. tell us where they are. we want to arrest them. >> suspect. it's just a suspect but it's very different than we just want to talk to you. >> yes. >> drew griffin, thank you very much. why they chose to put just this part of it out and only this part to the public around the world. i want to bring in now former counterterrorism expert jeff bead dee and don borelli. thank you for taking the time. jeff, you're here with me. you hear drew talking about this video, why they chose to put this and only this. what is your take on that? they have an incredible amount of video out there. they

we have also seen the photo of the black backpack that was shredded after that bomb went off. we also know that federal authorities are carefully scanning hundreds, if not thousands of images, still pictures and video from the scene. again, trying to link up the men who are believed to be responsible with images from boilston street, bill? >> bill: thank you, rick. good work today. through theal throughout throughout the night he will be with us. investigators had arrested a suspect and was bringing him there. although law enforcement officials later denying reports of an arrest. those denials came after a crush of media descended on the courthouse looking for any glimpse of a possible suspect. everyone on high alert there as can you imagine. this is where a suspect might go if the feds had made an arrest. then word of a bomb threat inside -- inside the courthouse, forcing workers to leave. they said it was a code red in the media was forced to step back. we're told that ultimately turned out to be a false alarm. and you can see workers pushing cribs down the street, possibly

they talked about suspect number one with the black backpack. we want to put that next to the picture that everyone had seen before of the black backpack when they seen it exploded when earlier this week.had released - now, jeff, you that i is very important. here it is. we're looking at that. >> exactly. and, you know tshgsz close. it doesn't exactly seem to be a match. and so one of the things that people need to be aware of and the public needs to be aware of when you're at a location is the possibility, heck, even shoplifters use this technique. it is a trojan horse. you could come into a place and you are carrying a backpack. >> we have one here. >> it has a number two on it. it's easy enough for you to take out the actual device that may house the weapon and put that down where you want to put it down and then you can just close it up and you continue your walk through the area so that when you next come into the view of the surveillance cameras, you're still carrying the same backpack and you decrease the possibility that you would be con

it seems the bomb was contained in a pressure cooker and carried in a black nylon backpack. at the moment, no more questions have been answered. my colleague has this report. >> runners were struggling to the finish line, their families watching, at cheering. then the unthinkable. cheers became screams. a moment of celebration and triumphed shattered. on the streets of boston, sights and sounds more familiar in countries at war. pavement spattered in blood as two bomb blasts claimed their victims. it was the cruelest of moments. >> i saw a trash can explode. people started throwing down the barricade and running over each other. i ran in the other direction as fast as i could. >> there was an explosion, the smoke. it was horrible. it was traumatizing. i do not know how else to explain it. >> i saw quite a few casualties. i saw one guy with his legs gone at the knees, ankles and feet missing, shrapnel wounds to the head. were least 140 people injured. three people are dead. it was a day the local hospitals had not seen the light of. .> multiple metallic fragments we removed p

it was hidden in a black backpack. what's left of it seen in this photo. the simple bombs were responsible for 12 seconds of horror. cell phone footage shot by a spectator between the two explosions. >> i have have victim here with shrapnel in the leg. >> we need another ambulance down here. 755 boylston. >> they're on their way, sir, they're on their way. i want all the s.w.a.t. teams to go back to the base right now and get their rifles, get their gear. >> reporter: authorities are going through race day videos frame by frame. here the white smoke seen after the detonation indicates a bomb built with low velocity explosive mixtures. unlike a more powerful military grade. >> they may not have the resources as we've seen in other bomb attacks, but they knew how to make the bomb go boom. >> reporter: experts say the large pieces of metal, seen here in the air, suggest the bombs might have been concealed in or under a mailbox or trash barrel, as one witness described. >> i literally saw the garbage barrel explode. i saw the flash, the fire and smoke and ran

it seems the bomb was contained in a pressure cooker and carried in a black nylon backpack. at the moment, no more questions have been answered. my colleague has this report. >> runners were struggling to the finish line, their families watching, at cheering. then the unthinkable. cheers became screams. a moment of celebration and triumphed shattered. on the streets of boston, sights and sounds more familiar in countries at war. pavement spattered in blood as two bomb blasts claimed their victims. it was the cruelest of moments. >> i saw a trash can explode. people started throwing down the barricade and running over each other. i ran in the other direction as fast as i could. >> there was an explosion, the smoke. it was horrible. it was traumatizing. i do not know how else to explain it. >> i saw quite a few casualties. i saw one guy with his legs gone at the knees, ankles and feet missing, shrapnel wounds to the head. were least 140 people injured. three people are dead. it was a day the local hospitals had not seen the light of. .> multiple metallic fragments we removed p

they reported that they believed the two bombs were contained in black backpacks or knapsacks and that would have been very heavy because of the nature of the bombs. the backpack you are describing and the photo that we've seen does appear to be a very heavy backpack. >> very heavy with a protrusion. >> yes. doesn't mean that's the guy but there is also a report about a suspect being seen on a surveillance video placing a bag down prior to the explosion taking place and it may match the person in the photograph. they may have gone back from that photo to find a photo or another image of these suspects together in one place and that is what led them to this picture that may identify the two people responsible for the bombings. the important thing here is not that the media have the latest information, but -- >> to get the guy. >> the important thing is, yes, that they find the people responsible for this. the last one i think anyone wants is to jeopardize the investigation and to send the guys underground. >> i have already are report on other media sources and am monitoring it closely

he was seen with a black backpack trying to get into a restricted area.led including an 8-year-old boy. more than 140 were injured. >> severe lacerations. amputees. a lot of shrapnel. pretty big explosions. a lot of blood everywhere. >> tributes have been pouring in. conan o'brien mentioned the attack in his opening monologue. >> we do have a great show for you tonight. >> good show. >> but i did want to start by mentioning what an upsetting and sad day it has been. i'm talking of course about what happened in boston earlier today. boston's my hometown. it's where i grew up. it's where my family lives and i wanted to take a moment that my thoughts and prayers are with the people of boston and everybody who has been affected by this absolutely senseless act. it's important to say right up top. that said, it is our job to do a show and we will try to entertain you the very best we can. given our track record gives you people a 0% chan20% chance of h good show. >> and ben affleck tweeted earlier saying such a senseless and tragic day. my family and i send ou

asking everyone to notice. >> one of the things you can see as you look at the tape is that the black backpack is one critical piece of evidence. my sources are telling me that backpack is the one that they recovered the most material from. the other thing is that every piece of evidence in that frame, the hat, the coat, the pants, they want the public to look at that because there might be something that someone would notice. >> that's right. and to look over every frame by frame, they sent everyone to the website, fbi.gov to check it out. and i know you'll be getting back to the phones as well, pierre. thank you. >>> as we said, the president today delivered a summons, a promise, and a blazing tribute in boston. and abc's linsey davis tells us more. >> reporter: the president came with a simple message. >> if they sought to intimidate us, to terrorize us, it should be pretty clear by now that they picked the wrong city to do it. [ applause ] >> not here in boston, not here in boston. >> reporter: at times, he brought them to their feet. at others, he brought them to t thsse was always to >>

believe they were hidden in black backpacks and the remains of one could be seen in this photo. >> they will try to take pictures back and see when the bag was this and when it wasn't there so they can get the exact time of placement. >> boston t station whdh has these pictures near the finish line with a large sack next to a mailbox. then, in this shot, taken after the explosion, the large bag is disappeared and investigators are asking the public for help. >> someone knows who did this. cooperation from the community will play a crucial role in the investigation. >> we are lending more of the three victims who died last night. a vigil for 8 martin richard. krystle campbell the 29-year-old restaurant manager is being remembered. as well as a chinese graduate student from boston university who was watching the race with friends. >> a massachusetts official tells use that authorities believe they have identified a suspect and an abc station in boston is reporting a suspect has been arrested but that is not confirmed by abc7 news. the grieving continues in boston with president obama and

people being asked to be on the lookout for a darker skinned or black male with a black backpack and a black sweatshirt, possible foreign national, accent unclear, what the accent of the individual is, but believes to have some sort of an accent. we are just getting that information. john king is working his sources now. he joins us with the latest on the investigation. john, what are you hearing? >> well, that bolo, shorthanded police lingo for be on the lookout, just issued. i will give you reporting from all of our cnn team. a little more on that bolo. law enforcement is looking for a darker skinned or black male with a black backpack, possible foreign national because of an accent. the bolo notes to law enforcement officials says five minutes before the first explosion, this individual attempted to gain entry to a restricted area and when turned away, he broke eye contact and pulled his sweatshirt and hood over his head. no further info on him is what the bolo says. this is law enforcement telling other agencies and telling the public through the release of this now through our so

marathon on monday, and they basically-- all they could do was to look for somebody that had a black backpack, and acting suspiciously. and they were able to identify two-- a man at each bombing site. that wasn't enough for them, but they did identify these two suspicious characters. the real turn came when they found out that those two individuals were walking together at one point. so you saw two men walking together, and then coincidentally, each of them ended up at one of the bombing sites. that was the key, and hoos how they figured it out. but it took extraordinary work. >> ifill: one of the other interesting things that came out of this-- it seemed like there was one revelation after the other, and peter, you would know something about this, because you've been there. thechech me an roots, and is ths domestic terrorism, foreign terrorism? >> we don't know. we have to be careful here. they have not lived in chech me as grown men. they grew up in krygyzstan and moved here in the early 2000s. one of thing brothers talked on the web how how chechnya ought to be independent from russia. thi

it was hidden in a black backpack. the simple bombs were responsible for 12 seconds of horror. cell phone footage shot by a spectator between the two explosions. authorities are going through race day videos frame by frame. here the white smoke seen after the detonation indicates a bomb built with low velocity explosive mixtures, not the more powerful military grade. >> they may not have had the resources as we've seen in other bomb attacks, but they knew how to make the bomb go boom. >> reporter: but tuesday there was a new plea for help in identifying the bomber. >> any individual who expressed a desire to target the marathon, suspicious interest in researching how to create explosive devices, the noise of explosions in remote areas prior to yesterday, which may have been used as tests by those responsible for these acts. >> reporter: the efforts to learn who is behind the bombing often require great patience and persistence. it took three years and only after the discovery of a tiny electronic part that authorities learned who was behind the bomb that brought down pan am fli

possibly black backpacks used, black bags used.nformation, wolf, as we herd susan candiotti report earlier, they could have been packed in some kind of a pressure cooker type bomb. >> are you getting new information also on what the scope of the explosion? >> law enforcement officials now saying that they found debris on the roof tops nearby. they found some debris from the bombs embedded in buildings nearby. tom fuentes said it carries about a 7,000 feet a second force. that gives you an idea of the scope. debris on rooftops nearby. some of these buildings are tall. >> getting new information on a letter sent to the united states senate that has tested positive for the poison ricin. stand by. [ male announcer ] the first look is only the beginning. ♪ ♪ this is a stunning work of technology. ♪ this is the 2013 lexus es and the first-ever es hybrid. this is the pursuit of perfection. and the first-ever es hybrid. we are outta here! finding you the perfect place. hotels.com. at a hertz expressrent kiosk, you can rent a car without a

a man with a black backpack and black sweatshirt reportedly tried to get into a restricted area. this is the instant that thousands of people went running for the finishing line to >> do we have any idea who may have caused the atrocity? >> this is a very difficult scenario to pick up on. >> we're going to talk to jason instead. i believe 31 patients are being treated there. what are you expecting to have happen in the next few hours there? >> it is going to be a lot of hard work for the surgeons here. there is just no other way to say it. one came out and said in the very beginning, piers, the ambulances were coming in drones. and basically saying no matter, they drill for things like this but nothing could have prepared them for what they are dealing with inside here. most of the injuries to the lower extremities. there are two people in critical condition fighting for their lives at this very moment. >> the worst of the injuries have been injury to the legs. a lot of injury to the muscle, the skin, the bones are broken. the shrapnel injuries have been ambient things thrown aro

he appears to put down a black backpack or duffle back on to the ground. they have said before that it appears that both bombs were placed inside some sort of black nylon backpack. that's how they are tying this person to the scene. the next is to try and identify who that person is, where he might be, where he may have come from, who he is tied to. that's what we assume they are doing today. it would be interesting to see if they release this photo to get the public's help in identifying him. we expect this to continue moving forward. fbi technicians were seen balking down boyleston street looking for any piece of the bomb they could find to put it back together and determine where the components were bought. that may be another way of tracking down this suspect. laura, i'll send it back to you. >>> all right. chris pollone, live in boston. we will continue to follow new developments surrounding the explosion here on "today in the bay" and on our website, nbc bay area.com. >>> the family of 15-year-old audrie pott has more than a few words for the school

both the same age it looks like from the pictures carrying black backpacks which match up with the backpack we've been watching since monday evening late sitting in front of the storm fence in front of the forum restaurant near the curb. an old polaroid. seeing it in develop in front of us. what's next, when they put out this universal apb, all points bulletin they put out 45 minutes ago, where are we going from here? are they sitting at some command center, a situation room waiting for the calls to come in. >> yeah, absolutely, chris. this thing is being run out of a joint operation center. we used to call it -- it's a jock and has all the representatives, all the participating agencies. their command presence. this is the nerve center. then what you'll have is you'll have basically just an army of investigators ready to take leads. so phone call comes in. it will and is it priority one, two, or three, and team one, handle this. the next team comes in. you go. it's going to be teams coming in, talking to people, getting additional information bringing it back and it will be triaged and put

backpacks. suspect number one is seen wearing a black hat, suspect number two is wearing a white hat. the fbi says he's the one seen on video leaving a bag at the site of the second explosion. the fbi warned that these suspects are extremely dangerous individuals. >> we consider them to be armed and extremely dangerous. no one should approach them except law enforcement. >> these suspects are at large and dangerous but the fbi says the public can help. >> somebody out there knows these individuals as friends, neighbors, and we are counting on you to provide information to us. no bit of information, no matter how small or seemingly inconsequential is too small for us to see each piece moves us forward. >> these two suspects are out there. the hunt is now on to find them and bring them to justice. joining me now is michael isikoff from nbc news. >> good to be with you. >> you heard the fbi press conference. what is your reaction? what did we learn and what do you take away from it? >> well, we learned a lot and it was a pretty dramatic press conference. first and foremost, we have the p

there he is, the backpack a black backpack may be the one that the fbi has been talking about since monday. suspect two comes along, we'll stop it right there. clearly, wearing a lighter colored backpack. investigators have urged people only to rely on the videos that they have released today, urging that they don't know whether others are legitimate. >>> on ktvu.com you can get another look at those photos and other released today. >>> the owner of a shop that sells running gear organized a vigil and a run. amber lee is live, the length of the run had significant. >> reporter: people ran three miles, one mile for every life that was lost. with candles in hand, runners prayed silently at the vigil. they say they may be injured in spirit but not in their resolve. many wore yellow and blue the colors of the boston marathon. they came from all over the bay area to honor the dead and the injuredded. >> - - injured. >> we're looking at the finish line right here. >> it's not clear, you have to keep going and just keep going. >> reporter: those who ran in the marathon tell us their emotions are

there he is, the backpack a black backpack may be the one that the fbi has been talking about since mondayighter colored backpack. investigators have urged people only to rely on the videos that they have released today, urging that they don't know whether others are legitimate. >>> on ktvu.com you can get another look at those photos and other released today. >>> the owner of a shop that sells running gear organized a vigil and a run. amber lee is live, the length of the run had significant. >> reporter: people ran three miles, one mile for every life that was lost. with candles in hand, runners prayed silently at the vigil. they say they may be injured in spirit but not in their resolve. many wore yellow and blue the colors of the boston marathon. they came from all over the bay area to honor the dead and the injuredded. >> - - injured. >> we're looking at the finish line right here. >> it's not clear, you have to keep going and just keep going. >> reporter: those who ran in the marathon tell us their emotions are raw but they're grateful their friends are not injured. >> when i see my f

. >> this is a black nylon which could be from a backpack. what appear to be fragments of beebees and nails possibly contained in a pressure cooker device. >>reporter: we are hearing from president obama. >> will find out we will find whoever harmed our citizens and we will bring them to justice. >>reporter: as the nation waits for justice, flag fly at half staff in washington, san francisco across the country in honor of those injured and killed. good evening i'm dab ashley while we still don't know who carried out the bombing or why, there are some new clue tonight. fbi released this im among late today of shredded black backpack holding one of the becomes that exploded yesterday and this image. officials there say it may the remains of pressure cooker bomb that exploded during the marathon with devastating consequence. those injured in the bombing boy from the east bay. 11-year-old aaron hurt of mary tip east waiting at the finish line for his mom when the first bomb went off. 7 news reporter amma in boston tonight and smoke with earn's fa

issued a be on the lookout bulletin for someone described as a darker skinned or black male with a black backpack and black sweatshirt. that person could be a foreign national with an accent. sources say he tried to gain access to a restricted area before the blast. police are also looking for a penske truck that tried to gain access to a restricted area. a federal law enforcement official told cnn that both bombs were small. and initial tests show no c-4 or other high-grade explosive material. suggesting the packages used in the attack were code devices. still >> there's a certain level of sophistication. having made these bombs before, it's not easy. you just can't get it on the internet, make two of these bombs go off fairly closely together. so somebody had some experience. somebody practiced. >> reporter: sources tell cnn that one, possibly two, unexploded devices also were found. potential treasure troves of clues about who may have made the bombs. authorities still have no idea whether they -- this is either a domestic event, or a foreign-based event. i'm told that it's still too soon to k

we know about these black backpacks and so forth. how many people in all honest -- owe i know this is sheer, raw speculation. but to pull this off, we know there were two bombs 150 yards apart, if i'm not mistaken. do you think it was two people, do you think it was three people? in your experience, what would the size of the gang be like? >> well, if it was one person, he or she not only followed very good trade craft in designing and placing the bombs, but also chose the location of these targets very carefully. he or she knew where the cameras would be pointed at to get the most maximum media amplification of this kind of attack. we captured it going off at the right time. the videos have obviously gone all over the internet. and that's sort of a characteristic of a lot of the al-qaeda tax, where they really shoot for media amplification of these kinds of things. >> i guess what i'm asking, i know it's a difficult question, as probably unanswerable at this point. is it possible, in your judgment, from your experience, and your stu

. >> reporter: the fbi says the pressure cooker bombs were hidden along the race route in black backpacks. the tattered remains of one of them seen in this photo. agents want to know if they saw someone carrying an unusually heavy bag. >> someone knows who did this. cooperation from the community will play a crucial role in this investigation. >> reporter: among those who have come forward with pictures that could help the fbi is boston tv station, whdh, which broadcast first this shot taken by a viewer near the finish line, note the large sack in front of the metal fence next to the mailbox. and then this shot, the station says was taken just after one of the bombs exploded. the area was blurred because of the graphic nature of the material but the viewer said the large bag had disappeared the fbi says anything that stands out is worth a second look, including these shots made seconds after the blast by ben thorndike from his office overlooking the finish line. >> i was struck by this individual everyone else in the photo is on the ground bent over holding their ears appearing to be in s

have is the man wearing the black hat and a black backpack nineteen year old dzhokhar stars now i have is the man wearing the white hat and a tan backpack police officer shot and killed the older brother early this morning but just got away the events from last night leading into today have been so fluid that the headline is constantly changing so i'm joined now by our team is ana stasi a who is near boston on a saucy i can you break down some of the events from last night well maybe you know last night at around five thirty pm local time the f.b.i. released pictures of the two suspects who now we know are two brothers twenty six year old son naive and nineteen year old just hearts and i and these two brothers basically for after the photos were released ended up getting out of their hiding getting into a seven eleven which they robbed hijacked a car releasing the person to whom that car belonged and got into a. car chase with police as a result of which the older brother to middle on was died out of hospital around one thirty five am local time with several gunshots from police he was

bulletin to other investigators to be on the lookout for someone who might have been carrying a black backpacke area of the explosions right before they occurred. so this might go hand in hand with that. we also heard governor deval patrick of massachusetts announce not long ago that there were two bombs and two bombs only. he went on to say that another device that had been found or a suspicious package, rather, that had been found, was blown up as a precautionary measure. so he said they're working with two bombs. we don't have information at this time any or details about the second bomb that was found, michael. >> can didcandy, this is suzann. did the law enforcement official tell you significance of the information, if it -- the pressure cooker if it might have created more shrapnel or if this was a crude device and how this would have impacted the injuries, kinds of injuries we saw in the blast? >> reporter: because it was made of metal, you're right that could have hidden shrapnel placed inside there. remember, we don't have specific information about the makeup of these bombs. we have

. >>> we have the remains of a pressure cooker, a shredded black backpack and some kind of ball bearings or metal pellets. what can we read into this at this stage? >> you are looking at what they have in this investigation, which is the bombs themselves. apparently two very similar if not twin bombs placed in black nylon bags that they are recreating as much as they can. at quantico. the fbi lab. it is how, who did this and why that they really do not have any leads on. you are looking at forensic evidence, it will be very important when they catch this person. but in terms of trying to find that person, i think it will be more difficult as they recreate the bombs. they will have to figure out where some of this material may have come from. perhaps this will spark a tip from somebody who knows about somebody was working with pressure cookers or maybe has just put trust them. but right now, it all seems to be centered around the forensics and putting this all back together, these bonds back together and try to figure out just how that operated and how they were put together. >> what woul

one of the men are seen carrying a black backpack. the attached photos are being circulated in an attempt to identify the individuals highlighted therein. feel free to pass this around to fellow agents elsewhere. cnn is not showing the photos, was not describing the men. we don't want to tip them off. we begin tonight with that huge explosion tonight. hazardous material crews have been rushed to the scene. witnesses say it sounds like a bomb went off. with me is glen robinson, the ceo of the hospital in waco. >>> can you tell me at the moment how big you believe the injury toll is as we stand? >> at this time, i can certainly give you the numbers that we're aware of in our particular system. we're one of 12 hospitals in our system. wech received a total of 66 emergency vehicles and we have at least two more choppers that we know are inbound at this time bringing us additional patients who have been injured. i would say that in talking to our trama surgeons just a few minutes ago, many of the injuries that we're seeing are not extremel

they said they are searching for a man darker skinned or black with a black backpack and black sweatshirt who reportedly tried to get into a restricted area minutes before the first explosion. this is the instant that thousands of people went running for the finishing line to running for their lives. steve silva captured the whole thing in this dramatic video. [ screaming ] >> i'll talk to the man who shot that video in just a moment. first, live to anderson cooper in boston. the death toll has risen to three. we now believe at least 138 people on top of that have been wounded. that is likely to rise as well. have we got to the full scale of this yet? >> i don't think we have. i think it's still early hours in this investigation and obviously, the triage on those wounded, that is well under way, as you said. three now confirmed dead and we just learned that just a few moments ago, earlier, about an hour ago we thought it was just two confirmed dead. it's not clear if that is likely to rise. we don't know the full extent of injuries but what we're hearing from doctors is there have been a

found images in a veins video that shows a possible suspect carrying and then perhaps dropping a black backpack similar to the shredded remains of a backpack believed to have held one of two pressure cooker bombs that caused all the carnage. for more on that in a moment, from "abc news," if you're surprised the suspect isn't already in custody it may be because you were paying close attention to the news today. here are some of the headlines curtsy of the "huffington post"." cnn fox, arrested. globe, imminent, ap, in custody. bnc and cbs yeah, no. they had it right. cnn insisted it had three sources of their story and ap said it stood by its information, the fbi insisted an arrest had not been made and offered a little advice, i quote quote, since these stories often have unintended consequences we ask the media particularly at this early stage of the investigation to exercise caution and attempt to verify information through appropriate official channels before reporting. meanwhile, the third fatality in the bombings has been identified. as linzi lu from china. we go to marcy gonzalez. what a

just behind the barricade you can see the black backpack that apparently later exploded. so here's how we got to this point. 10:20 p.m. last night eastern time. shots reported fired on the mit campus. 10 minutes later at about 10:30 p.m., a campus police officer found dead in his car. we now know that that officer was 26 -year-old sean collier. had been a member of the mit police force since january of last year. at about that same time, police get reports of an armed carjacking by two men. 30 minutes later, 11 p.m. eastern, the carjacking victim was let go unharmed. less than an hour later, police corner the suspects. then at 12:51 a.m., reports of gunshots. take a look at what it looked like as the swat teams moved in. now listen as the shootout is caught on amateur video. >> there is explosions and gunfire going on down the street. >> megyn: less than 10 minutes later just before 1 a.m., police report explosives have been detonated. by 1:25 a.m. there are reports that a suspect is in custody. we now know that suspect was the older brother. he died of numerous gunshot w

they believe the bombs were contained in what he described as two black nylon backpacks or bags. one point he called them backpacks. another point he just called them bags. they were contained in those bags. they would have been heavy given the explosives. he did point out that the investigation in his words, the investigation is in its infancy. infancy meaning they are just beginning this investigation. no one has claimed responsibility. no one has said that they were responsible whether domestically or internationally. he refused to speculate on who may have been responsible for this, the key words though the investigation is in its infancy. let's assess what we just learned and digest a little bit with john king who has been doing some serious reporting on this. our homeland security contributor fran townsend, our analyst is with us as well. first to you, john. these were important details but, clearly, if they have more clues they're not sharing. >> important details and the fact that the fbi special agent in charge right near the beginning of his remarks said he was appealin

this person might have been carrying a black backpack and wearing a sweatshirt and may have been trying to get into the restricted area around where the blast went off before the explosion happened. now doctors are also, according to our sources and information learned by colleagues, are removing ball bearings from some of the people being treated, one of the victims at one of the local 4078hospitals there. this could indicate what the explosive devices were made of. it's described as screwed and sometimes small. there were said to be at least two unexploded devices. my sources are telling me one of the things they're doing, john, are to pick those apart. they would to get the dna evidence for the way they were constructed. as of now, no one is making any claim that we are aware of, claiming responsibility for these lasts as well. john. >> susan candiotti. thank you. the unexploded bombs, there could be several of them. they could be a treasure trove. >>> it is very much a crime scene, i should tell you, in boston this morning. a large swath of the street, boylston street, two blocks be