nylon bag was inside the light nylon bag, making this picture perhaps more important to the investigationen looking at these pictures and studying them. what do you see? >> well, a couple of things stand out, one as you mentioned earlier was the mailbox. i think that that proximity of that light colored bag, the black bag that contained the ied, i think there would have been significantly more damage, it might have been tipped over, it might have been on its side. it would have been more crushed than you see in the picture. but it could be the synonymous with the black bag being behind or under the feet of where the crowd was at. i'm not sure if there was a stand or space where people were standing that actually blew that bag forward. it appears to me that i would say given the damage or the lack of damage on the green post office box on the side there, it may have been in another location. >> all right, well, thank you very much, ray lopez, 22 years experience in counter terrorism. we're going the talk to the chair of the house homeland security committee in a moment. we're going to talk

who might think, would have any slightest clue, did you know anyone who might have had a big black nylon bag, who might have said something disparaging about the marathon, clearly what i'm told by sources, the public briefing they said there were no suspects as yet. what i'm told in private is a frantic review of the video evidence under way. there are gaps in the forensics so far in terms of they have video images of the sites where the explosions are. possible video images of the devices on site. no video at least in the conversation a short time ago showing any suspicious person or persons dropping a package and trying to leave. that is an appeal to anyone, if they have any image that might help the investigation in this investigation. part of the debris, including what he believes were fragments in a pressure cookers were sent to the crime lab in quantico. try to reconstruct the explosive device, and then hope they can find a fingerprint, dna, some signature that might lead them to an individual or to an organization. i can tell you, though, at this point, wolf, all the sources i hav

remember, al, that the fbi describes two different black nylon bags.hink about -- if you think about these pressure cookers, a friend of mine, larry johnson, former cia, commented that these would weigh about 20 pounds each. that's a lot of weight for somebody to carry in that area, al. >> now, what kind of damage can these type of bombs do, these pressure cooker bombs? >> well, let's say, for example, in february of this year, a pressure cooker bomb was used in india, with us set off. 17 dead, 120 injured. in july 1976, a hijacking took place in america. croatian separatists hijacked a new york to chicago flight. during the hijacking they said, and if you don't believe we have a bomb, look in a storage locker at grand central and you'll see a pressure cooker bomb. new york pd found it, took it out, tried to render it safe. the thing exploded and killed a bomb tech. so these can be very deadly. and, al, these things have been used for 30, 40 years in afghanistan, pakistan and other places like this. >> now, does this suggest, then, i'm going to ask you

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it was determined both of the explosives were placed in a dark-colored nylon nylon bag. the bag would have been heavy because of components in it. it's difficult to determine specific components used until we can eliminate other factors. in fact, we won't know with some certainty until the laboratory completes the final review. away from the scene yesterday afternoon, the jttf begin an investigation. immediately after the bombing the f.b.i. initiated a command post. those on assigned to intelligence analysts and personnel from other government associated with jttf and including boston police, more than 1,000 law enforcement officers across many agencies have been assigned to this investigation. they begin can vags go sources. reviewing government and public source databases and conducting interviews with eyewitnesses and others to determine who is responsible for this crime. we are doing this methodically, carefully and yet with a sense of urgency. all across the nation and around the world, the force of the united states is working hard to locate those responsible. alre

black nylon bags, possibly at both sites. yes. black nylon bags as opposed to i think you said residue. i can't characterize the specifics of that. we are postulating they needed to be heavy bags to carry the devices. >> does it appear they were twin bombs? the damage the same in both, the fragments the same in both? >> i think that would be speculation right now before the evidentiary review is complete. the evidentiary review is still ongoing and i wouldn't want to speculate or characterize any more than i already have. >> how uncommon is it -- >> there are a variety of reasons why. this is a very complicated investigation. it is going to be pursued methodically, carefully, diligently but with a sense of urgency. we are barely 24 hours on into this investigation and so i would say it is still in the early stages and that is the best way i can characterize that. >> has the senior state ever issued -- [ inaudible ] -- as they were building their properties on boyleston street will you encourage them to do so with reinforcement gla

this morning it was determined that both of the explosives were placed in a dark colored nylon bag or backpack. the bag would have been heavy because of the components believed to be in it. we are doing this methodically, carefully, yet with a sense of urgency. at this time, there are no claims of responsibility. the range of suspects and motives remains wide open. >> that's fbi special agent in charge. the fbi's also examining, watch this. this is fascinating. examining photos like this one from nbc boston affiliate whdh to see if the nylon bags might have been placed in trash bags like that one there on the sidewalk to appear less conspicuous. look at it. look to the smile rising up to the left diagonally from that very spot where that bag was sitting. it's one of many possible leads. certainly an intriguing one the investigators are pursuing. the boy that was lost yesterday, 8-year-old martin richard, there he is. has become the face of the tragedy. of course, he died as i said yesterday. his sister and mother, by the way, are also seriously wounded right now and are right now in a

the nylon the same in both? >> i think that would be speculation right now before the evidentiary review is complete. >> did you find a circuit board or flragment of a circuit board? >> evidentiary view is still on jng going. i wouldn't want to speculate or characterize any more than i have. >> at this point, how uncommon is it at this point in the investigation, this type of attack, not to have anybody come forward? >> there are a variety of reasons why. this is a very complicated investigation. it is going to be pursued methodically, carefully, diligently, but with a sense of urgency. we are still very -- we are barely 24 hours on into this investigation, so i would say that this is still in its early, early stages. that's the best way i can characterize this right now. >> has the city or state ever issued guidelines to commercial property owners on how to deal with these kinds of attacks or disaster sasasters in the past? are you going to do that going forward if you haven't? as they're rebuilding their prope

they are looking at a nylon bag and fragments of that. they want to put together the signature of this, the fingerprint of this, in order to take it forward. they are going to look for vigilance from people. one of the things we talked about on the 9/11 commission was citizen activity and involvement. if you see something, act on it, tell people about it. that is going to be key. another thing that i think we're seeing acted out on the ground in boston is unity of effort and unity of command. how do we get a focused but unified effort on the part of our federal people? the fbi is taking the lead on this. alcohol, tobacco and firearms are another investigative body. but also the local police, the first responders. we need to collect information from people who might have heard something. >> we do not know if this was a group, an individual, domestic or international terrorism. what have you heard from the fbi update that gives you any sense of where they are looking? >> i think there were very clear that they are leaving it wide open. they

they are looking at a nylon bag and fragments of that. they want to put together the signature of this, the fingerprint of this, in order to take it forward. they are going to look for vigilance from people. one of the things we talked about on the 9/11 commission was citizen activity and involvement. if you see something, act on it, tell people about it. that is going to be key. another thing that i think we're seeing acted out on the ground in boston is unity of effort and unity of command. how do we get a focused but unified effort on the part of our federal people? the fbi is taking the lead on this. alcohol, tobacco and firearms are another investigative body. but also the local police, the first responders. we need to collect information from people who might have heard something. >> we do not know if this was a group, an individual, domestic or international terrorism. what have you heard from the fbi update that gives you any sense of where they are looking? >> i think there were very clear that they are leaving it wide open. they

they believe it was possibly a nylon bag. each one probably weighed 20 pounds.nificant weight there. new information on the more than 170 victims injured in the bombing. short time ago we got an update from boston medical center, one of several hospitals taking in patients after the explosions. boston medical took in 19 patients. of those 19, five had amputations, two still in critical. doctors say they've removed metal fragments as well as pieces of plastic, wood and concrete from the patients. back out here at the memorial at this barricade, i guess the goo not be here all that long. that's simply because each day the crime scene, which was 15 square blocks at one point, has been shrinking every day. we were a block further away. now we're a block closer to ground zero, i guess you could call it. as people come out here to take pictures and offer their condolences and their sympathy and prayers for the victims, this is going to be moving another block in that direction closer to where the bombs went off. live in boston, terry mcsweeney, "today in the bay." >>

the two bombs were in black nylon bags. could the nylon bag been inside of this other bag? they don't know, but they're very confident that they're looking for black nylon bags. and, you know, to john's point, go through your receipts. if you have any receipts of anyone buying two pressure cookers. that's where this is going. any tip like that could help break it, but it shows you they don't have any tip lines. >> in terms of the device itself, the pressure cooker, we've seen this used before overseas. it's been described as crude, as unsophisticated. explain what that means. if it does not require a c-4 or type of explosive. >> it's complicated and it's hard to deal with. but basically a pipe bomb, a pressure bomb, something with a pressure cooker, right, it's all basically the same. you take a metal object, you jam black powder in there, get it as tight as possible and then you insert or have a fuse that lights it. if the black powder or gun powder would light and so much heat would build up inside that pipe or pressure cooker finally would just -- that blast is actually

the items were placed in a dark colored nylon backpack. the bag would have been heavy because of the components in it. >> that was the special agent incharge of the boston area. this image released from the fbi, joint bulletin issued to law enforcement. it shows the remains of a pressure cooker. the fbi says it's part of one of the detonated boks. it shows this image of an exploded backpack. the fbi is examining photos like this from nbc affiliate, whdh. it shows the marathon route before the second bomb detonated. here is a picture of the same location after the second bomb detonated. sources tell nbc news that the triggering mechanism appears to have had a battery pack and circuit board, elements of a sophisticated system. both elements were recovered at the scene. joining me now is congressman ed markey from massachusetts. one of the people killed, krystle campbell is from your district? >> yes, she is. that is a good indication this goes beyond the city of boston. >> it does. >> this is all of massachusetts. there are tens of thousands

and they believe the bombs were carried to the scene in dark nylon bags and set off by timers. the fbi is examining photos like this from nbc affiliate whdh to see if nylon bags might have been placed in trash bags on the sidewalk to appear less conspicuous. a former bomb investigator says the experts know what to look for. >> they are able to recognize the minute pieces of an article that a civilian wouldn't even know what it was, but a bomb investigator like fbi or atf will say, that's from a clock. that's from a battery. >> reporter: boston police say the area was checked twice for bombs yesterday, but there was no security screening. >> because there is unrestricted access to the race course, simply because it's 28 miles long, people can come and go and bring items in and out. >> reporter: authorities last night searched the apartment of a foreign student who was injured in the blast and seen running away, but they found nothing, and he is not considered a suspect. investigators urge anyone who was at the scene yesterday to send them pictures and videos. one person respondi

nail fragments, bbs and scraps of black nylon have been collected.we can now put the names and faces to those killed. crystal and 8-year-old richards who is seen on a facebook page that is seen, no more hurting people, peace. >> patients are progressing. some faster than others of course. and there are still many of these patients who still need operations both tomorrow, the next day and friday. >> reporter: president obama will be traveling to boston thursday to a memorial dedicated to the victims. >> this was a heinous and cowardly act. given what took place the fbi is investigating it as an act of terrorism. >> reporter: we're now hearing about the third victim who lost her life from the finish line two blocks away. she was a chinese national and graduate from boston university. her family has requested that her name not be released. back to you. >> the organizers of the boston marathon have vowed that the attack will not stop the events. they call the marathon a deeply rooted tradition and a piece of the fabric of our community. >>> many bay area

the devices were put inside pressure cookers, and then put inside some sort of bag, something plaque nylon. investigators say they were designed to look like pieces of trash while they certainly were not. more than 170 were hurt, several losing their limbs. three people were killed including 8-year-old martin richard. his sister lost her leg. his mother suffered a brain injury. they're both recovering in the hospital. president obama calling these attacks an act of evil. >> if you want to know who we are, what america is, how we respond to evil, that's it. selflessly, compassionately, not afraid. >> and president obama will be in boston thursday. they're having an enter faith service for -- interfaith service for the victims. our bruce leshan has been in boston and has the latest from there right now. >> reporter: we are just outside one of the law enforcement staging areas on the boston common. and the authorities are pledging to go to the ends of the earth to catch the killer or killers. but the fbi is also pleading for help closer to home. this special agent in charge says these killer

they were put inside a black nylon bag or backpacks.e pictures of a shredded mangled pressure cooker and a shredded black nylon bag, always photo that appears to show ball bearings or small metal pellets. from the nbc affiliate here in boston they have picture what is believed to be the second explosion before the bomb went off. an object along the marathon route on the curb there. what looks like a box or a bag. after the explosion, something that has been partially blurred, you can't see the carnage that it left behind. but the box or bag is apparently gone. that area was the scene of that second blast. these are some of the photos that the f.b.i. is now looking at frame by frame. they are also looking at surveillance video and other sources trying to determine who might have least these packages behind and who might be responsible for these bombings that have cost three lives and injured more than a 170 others. >> shep: new pictures from fox 5 in atlanta, pictures the f.b.i. clearly has had for the last 24 hours but new to us thanks

the bombs concealed in backpacks or nylon bags. could have cost as little as $100 to build and were made of ordinary ingredients. pressure cooker pots that have been used for decades. the triggering mechanism included a battery pack and a circuit board. they were recovered at the scene and the bombs were packed with bbs, ball bearings and tiny nails meant to maim victims. they are updating the media this afternoon and for now there few details on who is responsible. >> there no claims of responsibility. the range of suspects and motives remains wide open. the person who did this is someone's friend, neighbor, coworker or relative. we are asking anyone who may have heard someone speak about the marathon or the date of april 15th in any way that indicated he or she may target the event to call us. someone know who is did this. >> authorities are following up on more than 2,000 tips from eyewitnesss. the fbi is examining photos like this one from wth to see if the nylon bags may have been placed in trash bags to appear less conspicuou

ground in nylon bags or half staff. terrorism.mbings. >> everyone i've talked to had moved on from the finish line by time the bomb went off. some were in shock and some are still very said. it's horrible to even think of a person to even want to do such a thing. >> earlier this afternoon we saw a canine doll up doing eight bombs week that area of h-p pavilion. >> the front page of the wall street journal said all so now we are in with the feds are calling a heightened alert. it's time to adjust our bad habits with indulging technology devices and look around. >> any time you're sitting next to a big man with a video and not alert means you are knight and heightened sometimes you need to look brown sometimes make a habit of what is one on around you. domestic or sarah orne make it bad for the bad guy. in several cisco or could be anywhere in the bay stanley roberts kron 4 news. >> once these winds calmed down it will still a lot more. 26 more hours and concord. will see temperatures for tomorrow morning with a calmer wind 34 and v

as well, there is a nylon bag into which this metal container or containers were placed.believe they probably used a nylon bag, a backpack or some other type of bag in which these were placed then put on the ground to try to do maximum damage. these items that were put inside are providing the deadly shrapnel that was -- that what happened when it blew up that injured so many people and took the lives of at least three. when you look at these things, you see how someone was able to put these devices together. we have some animation to show you as well. this is sort of indicating when they put gunpowder inside with these pieces of shrapnel, and they were ignited. when the gunpowder ignited. the pressure built up inside this container, according to our experts, and that blew the thing apart eventually. the fbi is asking for as much help as they can from the public. they already received hundreds if not thousands of tips and many photos, and they need more because they said someone out there knows who did it. >> the person who did this is someone's friend, neighbor, co-worke

. >> and, bret, tonight the fbi confirms that it believes both bombs were concealed in black nylon bagsbackpacks and would have been heavy. they are asking for anyone who may have seen anyone carrying unusually heavy bags near the finish line to contact authorities. more than 1,000 investigators and police officers have been assigned to this case. but it's still very early. the range of suspects and possible motives is wide open. army northward humvees rumble through the streets of boston protect the most humbling crime seen in the history of this city. the blast near the finish line of the marathon jarred runners of other their feet. wounding 176 people, killing three. including 8-year-old martin richard whose mother and sister were also gravely hurt. 29-year-old restaurant manager crystal campbell was also killed. she was there with her best friend to take a picture of the friend's boyfriend crossing the finish line. at least 17 of the victims are described as critical. many lost limbs, with most wounds to the lower extremities. doctors are finding dozens of nails and ball bearings in

dark-colored nylon bag or backpack. the bag would have been heavy because of the components believed to be in it. at this tonight, -- point it would be difficult to determine the components use. we won't know with certainty until the laboratory completes its final review. away from the scene yesterday afternoon, the jttf began its investigation. immediately after the bombing, the fbi initiated a command post. those assigned to the jtf, an lifts and other personnel from every state, local, and federal government agency associated with jtt if. and many others on their own, including boston p.d. and mass state police, more than 1,000 law enforcement officers across many agencies, had been assigned to this investigation, via the command post. they began canvassing sources, reviewing government and public source databases, and conducting interviews with eyewitnesses and others to determine who is responsible for this crime. we are doing this methodically, carefully, yet with a sense of urgency. all across the nation and arou

. >> among items partially recovered are pieces of black nylon that could be from a backpack that appear to be fragments of bbs and nails contained in a pressure cooker device. >> they are expediting this lab evidence to quantico, virginia for a thorough analysis. >> in addition the this morning, it was determined that both of the explosives were placed in a dark-colored nylon bag or backpack. bag would have been heavy because of the components believed to be in it. at this point it's difficult to determine specific components that were used until we can eliminate other factors that may have been already present. >> greta: who is the evil killer? who killed an eight-year-old child and terrorized thousands of people. new information, photos of deadly explosives to take a look what is left of one of bombs. our fox station in atlanta believed to show the actual bomb used in the attack. for the latest, we go to rick levanthol live in boston. rick, the latest? >> reporter: remarkable set of photographs. you heard clips from the news conference from the f.b.i. and other authorities who made ve

he said the bombs had been set in some sort of dark nylon bag, perhaps a backpack. he said the joint terrorism task force along with 1,000 or more law enforcement officers have all been assigned to this case and are working at it and will go to the ends of the earth to figure out who did this. they have 2,000 tips from the public as of noon today. but he said they need more help. he said somebody knows who this is. the person who did this is friends with somebody, said something to somebody, and they urged over and over again for that person to call in and expose this person, even though there have been no claims of responsibility so far. again, the investigation into the bombing in boston is in its infancy, it's going strong, 2,000 tips so far, they could do a few more. >> all right, all that goes on in boston and in quantico, more than 1200 people from the d.c. area ran in the boston marathon and many arrived back home today amid all kinds of security at airports all across the country, including here at reagan national. that's where kristin fisher joins us live.

. >> and, bret, tonight the fbi confirms that it believes both bombs were concealed in black nylon bagspacks and would have been heavy. they are asking for anyone who may have seen anyone carrying unusually heavy bags near the finish line to contact authorities. more than 1,000 investigators and police officers have been assigned to this case. but it's still very early. the range of suspects and possible motives is wide open. army northward humvees rumble through the streets of boston protect the most humbling crime seen in the history of this city. the blast near the finish line of the marathon jarred runners of other their feet. wounding 176 people, killing three. including 8-year-old martin richard whose mother and sister were also gravely hurt. 29-year-old restaurant manager crystal campbell was also killed. she was there with her best friend to take a picture of the friend's boyfriend crossing the finish line. at least 17 of the victims are described as critical. many lost limbs, with most wounds to the lower extremities. doctors are finding dozens of nails and ball bearings in som

the fbi says it's found the mangled remains of what appears to be a pressure cooker in a black nylon back that possibly held the bombs. the fbi is also examining photos like this one where you can see what looks like a trash bag next to a mailbox. that same shot just moments after shows a devastating scene. invest garretigators are lookin whether the devices were put in trash bags to hide them. meantime, they continue to ask the public for help in the form of pictures, videos and tips. >> the person who did this is someone's friend, neighbor, co-worker or relative. someone knows who did this. >> former mayor rudy giuliani in office during the 9/11 attacks weighed in on "morning joe," saying people need to give investigators more time to come up with answers. >> i think that impatience with the investigation is a little misplaced. i was in london the day of the bombing and back in 2005, it took a while to catch those people and they have maybe three times the surveillance cameras that we have. >> also today, mourning the victims. vigils and new details emerging about those killeded in

it appears to be two twin bombs placed in nylon bags. pressure cookers were used. john king's sources telling him that the devices were very similar. earlier in the day, we heard from the special agent in charge from the fbi who called one of the bombs possibly a pressure cooker. now we're seeing the release of these photos. and what those photos are, they come from a bulletin that is sent nationwide, erin, to bomb experts all across the country and to fbi agents and other officials all across the country for a specific reason. had you had any cases, have you seen anything like this? have you come upon any kind of scene where this was a pressure cooker involved in any kind of detonation? anything that would spark a lead or a tip in this case. you mentioned that they'll track down serial numbers and possibly where these were purchased. that is a lot of legwork to go through, erin, but if you could get a tip, if you could find somebody who knows of some group, some person, some anybody who had been experimenting with pressure cookers, that could be an invaluable tip.

nails, bbs and ball bearings were packed into two six liter pressure cookers and stuffed into black nylon backpacks. investigators also recover ed a circuit board that may have been used as part of a timing device and the fbi is looking at photos like this from nbc affiliate whdh to see if the nylon bags might have been placed in trash bags on the sidewalk to appear less conspicuous. there are still no suspects, but the fbi is sifting through as many as 2,000 tips and tens of thousands of videos and photographs. president obama will travel to boston tomorrow for an interfaith service to mourn and to pray. he called what happened terrorism. >> this was a han niehaus and cowardly act and given what we now now about what took place, the fbi is investigating it as an act of terrorism. anytime bombs are used to target innocent civilians, it is an act of terror. >> among the dead, 8-year-old martin richard, 29-year-old krystle campbell and the third victim is a boston university grad student from china whose parents asked her name not be made public. let's get to the latest with pete williams.

in addition, this morning, it was determined that the explosives were placed in a dark-colored nylon backpack. it would have been heavy because of the components believed to be in it. at this point, it is difficult to determine specific components used until we can eliminate other factors that may have already been present in the environment. we will not know with certainty until the laboratory complete the final review. away from the scene, yesterday afternoon, the jttf began its investigation. immediately after the bombing, the fbi initiated a command post for those assigned to the and many others on their own including boston pd in massachusetts state police. more than 1000 officers across many agencies had been assigned to this investigation be of the command post. -- via command. they began conducting interviews with eyewitnesses and others to determine who was responsible for the crime. we are doing this methodically, carefully, yet with a sense of urgency. all across the nation and around the world, the force of the united states as locating -- working hard to locate those res

. >> we have pieces of black nylon that may be from a back pack. fragments of bbs and nails that are contained in a pressure cooker device. >> no matter who is responsible boston residents are not letting this define where they stay. >> we will not do that. i refuse to do it. >> a pitcher said end boston showing what happened and what appeared to be the second bomb right before it exploded. the first one that went off, they're not sure if there was a pressure cooker filled with a ball bearings and nails. cnn in reported that the lid of the pressure cooker was found on a roof of a building where the bomb exploded. this one is courtesy from boston and this shows the second bomb moments before it exploded. >> a bay area boy, wounded in the marathon bombing, is scheduled to undergo a another surgery today. 11 year-old aaron hern martinez, was near the finish line, cheering on his mother who was running in the race, when he was caught in won the blast. he is in stable condition in the intensive care unit. back here in the bay area, his grandmother says

. >> it was determined that both explosives were raised in a dark colored nylon back pass epack -- backpack or bag. >> and we have more information on the chinese graduate student who was killed in the blast. china has identified her. this is a picture from the post that we just got this morning. an editor said her father confirmed her death when reporters visited the family home and there is a chinese language where condolences are being left on their microblocking event -- microblogging event and when last checked, more than 14,000 comments had been left there for her. >>> she was among the three people killed but also an 8- year-old boy died, martin richard died while watching the ce with his parents father and sister. and crystal campbell had been going to the boston marathon and watching it since she was a little girl. many are going to pay tribute to the bombing victims. [ music ] >> this was a very emotional scene on the boston common. people from all over sang songs and lit cancels and called for peace. it is part of the heightened security in the wake of the bombings. >>> a maratho

. >> among those things and partially recovered were pieces of black nylon which could of been a backpack and fragments what could of been bbs and nails possibly contained in a pressure cooker device. >> no matter who was responsible boston residents are refusing to let this attack shut down their city. >> terrorism is a way of making you fear and change the way you live. i refuse to do that. >> president obama will be coming from washington to boston tomorrow participate in a prayer vigil. >> a picture that was sent in to aid to the aged in boston and showing what appears to be the second bomb on the sidewalk. right before it exploded. this is the one that one off 10 seconds and about a hundred yards down the course of the first bomb. it has not been released by authorities as to whether or not this second bomb was a pressure cooker device little with ball bearings and nails. we've heard from our cnn affiliate's that the pressure cooker lead on the first bomb has now been found on our roof of a building adjacent to where it exploded. this appears to show the second bomb right before it e

we're also seeing from police today some video of the implements that were used, nylon, black bag that were used to carry these pressure cookers and, of course, we're expecting the president to come to boston today along with the first lady for an interface prayer vigil. a lot going on in boston today with this investigation, kelly. >> that's right. chris pallone again following it for us. we'll be back with you in the next couple of minutes for the latest in that situation. >>> also, paul kevin curtis has been identified as being tied to the ricin letters with his infamous signoff, i am kc, and i approve this message. a few suspicious packages still remain on capitol hill which have not yet been tied to curtis. >>> and another tragedy in the u.s. last night, a blast went off at a fertilizer plant in west, texas. the department of safety reports about 100 injuries and many confirmed fatalities. significant damage was reported to structures several blocks away, including 50 to 75 homes. the blast was reportly heard more than 45 miles away. texas governor rick perry said the investigatio

it may have been stuffed in a bag with black nylon. one al qaeda affiliate has specifically mentioned pressure cookers. the homeland security warned about the devices after one was used in the attempted times square bombing. the fragments themselves the doctors have been removing from victims. >> that will be the job to find out where the nails came from were they purchased at lowes or home depot or a small town close to the scene. if they were when they were purchased. is it possible to determine who purchased the nails and when they did. >> in that vein nain they are painstakingly to reconstruct the bombs not just how they were made but who made have made them. >> doug luzader we just don't know who yet. >>> all mail delivery to the u.s. senate has been stopped this after a letter containing the potentially deadly poison ri ricin was sent to a u.s. senator. peter doocy is outside of the senate mail facility. good morning, peter. >> good morning patti ann. the suspect levtter never made t to roger whittaker's office. the building behi

in addition, the items were placed in a dark colored nylon backpack. the bag would have been heavy because of the components believed to be in it. at this point it is difficult to determine the specific components used until we can eliminate the other factors present in the environment. in fact, we wouldn't know with some certainty until the laboratory completes its final review. away from the scene yesterday afternoon, the jttf began its investigation. immediately after the bombing, the fbi initiated a command post. those assigned to the jttf intelligence analysts and other personnel from every state, local and federal government agency associated with jttf, and many others on their own's including boston pd and mass state police, more than a thousand law enforcement officers across many agencies have been assigned to this investigation via the command post. they began to canvass sources and conduct interviews with others to determine who was responsible for this crime. we are doing this methodically and carefully. all across the nation and around the

cÁmara de vigilancia de una tienda permitiÓ la identificacion de la persona que dejÓ una bolsa de nyloncomenzÓ a circular la version que resultÓ ser falsa que un sospechoso fue arrestado. los medios de comunicaciÓn se fueron a una corte de boston. trascendiÓ que nadie habÍa sido detenido y se alertÓ de una amenaza de bomba y el edificio tuvo que ser evacuado. las autoridades, que habÍan confirmado avances sÓlidos en la investigaciÓn, mostraron la evidencia que encontraron en el Área afectada por la explosiÓn. misma que les ha permitido deducir que el atentado, fue ejecutado con 2 ollas de presiÓn para cocinar. convertidas en bombas. >>> hay bastante evidencia material mÁs de lo que habÍa esperado. >>> el profesor david scott, experto en terrorismo. dice que a pesar de ser bombas de fabricaciÓn casera la evidencia en la escena del crimen puede ser determinante. >>> no es una pila comÚn y corriente es posible que se pueda encontrar el origen. >>> la pila conectada a unos cables, fue parte del sistema para detonar la bomba, junto con un circuito inlr integrado se encontraron pedazos en la

the black nylon bags. who's carrying black nylon bags, black backpack. we know about where the bombs were placed. 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