Joseph Jackalone News Today : Breaking News, Live Updates & Top Stories | Vimarsana

They'll tell me that they have seen it twice now. and nobody has seen this person that they know of. some people thought he might have had a place to stay in the neighborhood. i will tell you that police were going to businesses asking for videotape from security cameras, and in some cases, viewing security camera video. so there may be some record of him in this neighborhood in the last 24 hours. if that van was rented yesterday in philly, it's only about a six-hour drive up here from there. he could have been in this neighborhood for quite some time. >> miguel marquez for us in brooklyn on t...

Jackalone, a former nypd official. he's been with us all morning helping us understand that. we're getting accounts from witnesses who say that they heard an explosion, they saw the stampede, they were there when this all happened. but again, i think if there's one glare historic here, it's this really could have been so much worse. >> yeah, if you just think of the consequences of what happens when people start to panic. so, there could have been a trampling effect, could have been a lot of different things that happened. people get knocked down stairs and the like. so this is, you know, an u...

Formulas, if it was a pipe bomb, or how to make a vest, or find simple chemicals you would be able to buy at a home supply store, as opposed to military grade chemical explosives, pten for example, or the fact that this person did not have an ak-47 with him, where he could have inflicted, you know, dozens if not hundreds of casualties. so it does indicate that it's probably a pretty amateurish operation. hopefully, only one person then is not connected to a larger group who are attending multiple attacks based on this plan. >> a similarity, joseph, that we're seeing between this attack and the...

Scene the coming days? >> well, i mean, one of the things that they talk about is that, you know, somebody who's looking very nervous at the moment, you know, looking around. but you know what, if anybody's been a tourist in new york city, they do look nervous when they're going into subways or trying to figure out where they've got to go. this is a very unfortunate circumstance that police are going to have to deal with. and there's no way that you're going to be able to pick somebody out of the crowd. you're not going to be able to do this. i know we have tv shows and people think that the p...

Less let them loose. >> and we are learning new details about sweat's accomplice richard matt mattand his final hours. it was from here that matt fired several shots, one of which hit a recreational vehicle nearby. those shots would eventually help searchers zero row in on matt. to discuss all of this former nypd detect joseph jackalone. any first question for-- my first question is these shots apparently helded authorities find richard matt. why would he call attention to himself like that? >> in that moment he got desperate. sweat had left him. he was pretty much on his own. there was alcoho...