there is an uneasy calm in new york city this morning. it follows a terrifying explosion a little less than 24 hours ago. the fbi, the atf, and the police are working to find out who did this and why. good morning, i'm chris jansing, and here's what we know. 29 people were injured when the plast went off around 8:30 p.m. local time. one person is in serious condition. all the people are expected to survive. less than three hours later, another suspicious device, a pressure cooker taped up with wires and a cell phone was found just blocks from the site of the initial blast. it was carted off by police for further investigation.

residents in the usually bustling chelsea neighborhood described a bizarre and frightening scene. >> here in new york city, i lived here 30 years, you hear stuff every day. it was like, wait a minute. what is that explosion? and then everything got crazy. >> at a news conference shortly before midnight, bill de blasio tried to put a nervous city at ease. >> there is no evidence at this point of a terror connection to this incident. this is preliminary information, something we'll be investigating very carefully, but no evidence this point of a terror connection. but we do want to be very clear, the early indications, initial indications was this was an intentional act. >> the blast following the explosion of a pipe bomb near a charity race in new jersey saturday. they have no evidence the two are connected but will continue to investigate.

tammy leitner is near the scene in new york where all of this happened. what's the latest on the investigation? >> reporter: chris, still a very active crime scene out here. blocks and blocks of manhattan closeed off. there are actually two crime scenes. the first one is behind me about a half a block down, and that's where the explosion happened last night. saturday night, a very busy area in new york, a lot of people out to eat, a lot of restaurants. one person described the explosion as it sounding like lightning. anotherperson who was just across the street from where it happened said his building actually shook and a mirror fell off the wall. let's listen to more of what he told me just a few hours ago. what did you hear? >> a loud boom that now is clear was a bomb, but at the time, i thought it could be a manhole cover or some other maybe a transformer explosion. ran outside, and noticed that a mirror had flown off the wall in

my apartment. >> the blast was so powerful that it shook a mirror off the wall in your apartment across the street? >> that's correct. >> wow. so what happened? >> so, i ran outside and saw glass all over the street. noticed right away that the capital one bank retail branch, the window had been blown out. there was a woman screaming. and police arrived within a few minutes. >> must have been police in the area. they responded very quickly. >> it appeared as though there were police potentially on sixth avenue and heard the blast and came out. i was very confused, dazed, a little scared. and people were running and screaming. a woman exited her residential building, looked very confused. i asked her if she knew what happened, no, but her chandelier fell on her head at her dining table. i helped escort her to medical

care, but not sure if she got in. i noticed that the glass at the church right next door to with the dumpster had exploded, fell down from the very high windows, and there was glass all over the sidewalk. and it occurred to me at the time that maybe people had been injured. >> a very scary moment for a lot of people that were in this area. now, as you mentioned earlier, chris, the mayor declared this an intentional act that may be because they have recovered surveillance video of somebody in the area putting something in that dumpster before the explosion happened. now, as you mentioned, there's a second crime scene. that's about four blocks away from here. several hours after the explosion happened here, someone discovered a pressure cooker lying on the side of the sidewalk. what caused concern is there were some wires sticking out of it. police were on the scene until very early in the morning, and finally the bomb squad took the pressure cooker to a location in the bronx where they will go through it and determine exactly

what it is. >> i know that neighborhood well. i lived there more than ten years and i'm wondering because that's such an incredibly busy area, a lot of people live there, a lot of businesses, are people able to come and go? is there any indication of when some of the businesses might be back up and running? >> i can tell you, i was out here until 2:00 a.m., and everything was closed off. now, this morning, a few hours later, they have opened fifth avenue up and down and some of the side streets. you can get down here. it's limited, though. there's about four to five blocks that are still closed off, as i mentioned. no cars, no pedestrians in that area. >> tammy, thank you for that. i want to bring in malkin nance, an nbc terrorist analyst. malcolm, good morning. >> good morning, chris. >> you know this, at the new york city mayor, bill de blasio, said the explosion was intentional, but no evidence it wrauz an act of terrorism.

how kwiblsed do you think they are to say that, and what are the kinds of things they were looking at to tell them this is terror, this is not? >> well, the mayor was very careful in his words. and if you note, what he said was we have no evidence at this time. the evidence may lead to an act of terrorism. it's certainly the intentional destruction using a destructive explosive device, in itself, could be either a hoax, a prank, or terrorism. that will require them to do the analytics on the explosive device and the secondary device to see whether that was actually intended to be the device which drew law enforcements in. but you have to understand, the definition of terrorism is an act of violence or threat of violence intended to influence an audience outside the immediate victims. that has almost been fulfilled. we have to wait and see what is the nature of the attacker's

ideology, what was his intent. people shouldn't get focused on the fact whether it was demastic or international. whether it was an american or someone from isis, who knows. this was an amateurish attack, but it has all our attention now. >> we're about 11 hours away from the original explosion new york has had since 9/11 one of the best groups of people for dealing with this thing in the world, i would argue. let's talk about what's happening. we know there are surveillance cameras in that area. evidence crews have been there throughout the night. tell us what they're doing to try to figure out what exactly happened. >> you're right. i think new york city's counterterrorism unit is possibly the best in the world, outside of a national level intelligence agency. what they're doing right now is they and the jttf, probably led by the fbi, are breaking down into subunits which are all going to take the forensic

evidence related to the actual device itself andthen there will be teams who will analyst all of the media which can be collected. that's the video cameras, personal cell phone cameras in that immediate area of the bomb. then going out in concentric circles of about a block, there will be other teams tasked to analyze the media and they'll try to put together a 360-degree view of the moment that device went off and then work it backwards. who was on the street leading up to the device, who was going away from the device, who was near it. again, we have a secondary device which was left two blocks away down on 23rd street. now, the big question that we have in the counterintelligence community, i have been going over this for the last five hours, is was that device a hoax intended to bring law enforcement to that spot first. then they would have clustered up down near the real device.

we saw this tactic used in the sandy springs bombing in 1997, which was designed to actually injure and kill first responders to the first device. so there's a lot of analysis going on throughout all of these teams to determine what was the intent of the bomber at the time he blew the device. >> again, we have that first explosion on 23rd street. four blocks north on 27th is where they found the secondary device. a photo went out on social media, malcolm, from new york city alerts. this pressure cooker device, and it was taken to the bronx for robots to get a look. what's important here and how quickly will they be able to determine if these two are likely from the same source? >> well, they're going to throw a lot of resources on this. we should know this relatively fast, or i should say law enforcement is going to know relatively fast. that pressure cooker device is interesting because, you know, a few years back in one of al

qaeda's first magazines, inspire magazine, they wrote an article about how to make a bomb in the kitchen of your mom, using a pressure cooker device. however, ieds of this type, pipe bombs and pressure cookers are found all the time in the united states from people playing around with devices or doing malicious intent. they're going to break that device down. if it's determined whether it's a real device or a hoax device, and as we heard earlier in the analysis, they're going to walk back all the information about it, where it was purchased, when it was purchased, who purchased it, and they're going to cross correlate that with everything that they know about the exploded device. not to mention, they're also going to cross correlate it with any devices which have been blown up in the united states which are similar and the one that blew up in new jersey earlier in the day, which may have been a different type, but it could have been manufactured in the same bomb factory.

>> you also have the fact, malco malcolm, that this is intact. who knows if this is just somebody who thinks they can play around with something that's obviously incredibly dangerous and not funny in the least. there could even be fingerprints of some sort of trace evidence to lead them to somebody because they, again, have that device intact. >> right. i'll tell you one thing that i find always amazing about these snenlts. especially the lower grade incidents. this appears to be a little more on the amateurish side. these people don't seem to watch the tv show csi. often, they will leave fingerprints or tray to do something clever by using rubber gloves. all of these things leave some sort of signature, so there's no such thing unless you're doing this in a vacuum and handling it in a biological weaponed container, there's no way to not leave evidence. it's good police work, gum

shoeing and applying all the law enforcement analytical efforts toward finding out what is actually there, was this a real device, and was it related to all the other devices. >> malcolm nance, thank you so much. it's always good to talk to you. >> coming up next, we're going to take an even closer look at the steps investigators are going to take to figure out who made this device and who is behind the second device. we'll hear from former eer atf analyst jim cavanaugh when we return. dad, one second i was driving and then the next... they just didn't stop and then... i'm really sorry. i wrecked the subaru. i wrecked it. you're ok. that's all that matters. (vo) a lifetime commitment to getting them home safely. love. it's what makes a subaru, a subaru.

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my mom was working, and then we heard this big room, and like, me and my dad just rushed to the window to see what was

going on. but we couldn't see anything. and like, it sounded like a million pianos just dropped or there was like a big thunderstorm. >> that was a very young witness describing the scene in manhattan's chelsea neighborhood last night after an explosion injured more than two dozen people. a suspicious device was also found blocks away from that blast and is now being analyzed. the presidential candidates weighed in on the explosion. here's what donald trump told supporterer at the beginning of his rally in colorado springs last night, followed by hillary clinton speaking with reporters upon her return to nrk. >> just before i got off the plane, a bomb went off in new york, and nobody knows exactly what's going on, but boy, we're living in a time. we better get very tough, folks. we better get very, very tough. just happened. so we'll find out. but it's a terrible thing that's going on in our world.

and in our country. and we are going to get tough and smart and vigilant and we're going to end it. we're going to end it, so we'll see what it is. we'll see what it is. >> secretary clinton, do you have any reaction to the fact that donald trump immediately upon taking the stage tonight, called the explosion in new york a bomb? >> well, i think it's important to know the facts about any incident like this. that's why it's critical to support the first responders, the investigators, who are looking into it, trying to determine what did happen. >> for more on the investigation, let's bring in jim cavanaugh, msnbc law enforcement analyst and former special agent in charge for the atf. always good to see you. i know you were on this all last night as i was watching. i'm very curious about what's going on this morning in the bronx. we were talking with malcolm about the secondary device, the

pressure cooker. they took it there in a specialized container. a robot is going to check it out. give us a sense of the procedures they're walki ing through. do a deep dive for us on what's happening there with the investigation. >> well, the bomb squad has got it at rodman point up there, an isolated place where they can deal with it. you're exactly right. what they want to do is deal with this in a remoete fashion. a new york city bomb squad officer was killed many years ago in the '70s, bryan murray, when they tried to remotely enter a pressure cooker bomb that croatian terrorists had left at laguardia airport. they claimed they had a bomb they left in the locker at laguardia they claimed they had on the plane, so the bomb squad was duty-bound to try to get in there and see what the bomb was, and they had trouble opening it and had to make an approach to it, and it detonated and killed the officer. that was in a pressure cooker. but they have it up there.

they're going to deal with it remotely. they're probably going to try to open it up remotely, you know, the prize is to get the thing completely intact without exploding it, if possible. of course, again, done remotely, with a robot, all behind shields. if they can do that, remotely render it safe, as we call, then there's a lot more evidence to look at. if in fact it turns out to be a real explosive device. >> we don't know whether or not it was even operational. if they have the intact device but you're comparing it to something that detonated, how difficult is it to make that comparison? >> it moves you way ahead if you have it intact. let's say it detonates. either at their range, inside the containment vessel, somewhere they can deal with it, there's no problem putting it back together. the bomb squad, the atf, the fbi, we train this to everybody,

post-blast investigation. everybody inside baseball here, we run a procedure for that at the atf academy, how to do that. every single atf agent is totally trained on post-blast investigation. we put these bombs back together. >> so they'll be able to do that with the first device as well? >> oh, yeah, absolutely. that first device, they'll know all the components of that device pretty quick, probably already do. that's a small scene. we consider that a small scene. we could put that together pretty quickly. not necessarily in the first device do you have such an elaborate mechanism. that might have been something just put in there as a diversion, as a bomb to run the crowd to the second device. if the second device is real. and that's an important issue here because there's no real reason, purpose, a terrorist would want to attack a dumpster on 23rd street. you know, and so if that second bomb is real, then i would say

this first bomb is more, you know, an entrapment device. it's sending you the other way until they can command detonate by use of a cell phone, you know, the other bomb. if it's in fact real, it would contain a lot of fragmentation, nails, bbs, ball bearings like the bomb at the boston marathon. that's the big question this morning. is the pressure cooker bomb the nypd bomb squad has a real bomb? if it is, we're looking at the first bomb was to send the crowd back there and maybe get the crowd, maybe get some emergency responders back there on a command detonation and that may have malfunctioned. so when they tried to detonate the second bomb, it may have malfunctioned. now, it could still be a hoax bomb, but it's either one of those. not a pressure cooker with old corned beef. somebody either put a hoax bomb there after the events and thought they would be cute, or

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you're looking at the spot where about lev hours ago, an explosion rocked the comehelsea neighborhood of manhattan. police are also looking at a second site of possible suspicious activity. tammy leitner is near the scene. we heard from police around midnight last night as well as mayor bill de blasio. are we expecting to hear from them again this morning and get an update?

>> we are. hopefully at noon, there will be an update. and at that point, they may have some idea of what the first explosion was and possibly what that pressure cooker was as well. now, they have allowed a few people to go into their homes on this block only. other blocks are still blocked off, as i mentioned earlier. the explosion happened right down the street from where i'm standing. people described hearing a loud boom. glass blew out on the street. one thing i want to mention. there was a second explosion yesterday on the jersey shore. now, that happened at 9:30 in the morning, a very crude pipe bomb went off in a trash can out there. they're not saying they're connected but certainly something they're looking at. >> thank you very much. again, noon today, an unidate to hear more on what happened on 23rd street, the secondary device that was not detonated and could there be any connection. they don't see one to the pipe bomb that tammy just talked

about. i'm chris jansing in new york. thank yous for watching. alex witt will have more coming up at 9:00 eastern, hearing from investigators about how they will try to find out whoever is behind this. your business starts now.

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