Concussion Blast News Today : Breaking News, Live Updates & Top Stories | Vimarsana

Bit on edge. the fire teams here that the ambulances they have have reved up like they're ready to move into action. but right it appears the s.w.a.t. team have moved on that house to rescue those four firemen that are still being held in that house. >> david, sounds like what you're saying this is all coming from the police and law enforcement side, the explosion that's you're talking about. they're not from the gunman or it is impossible to be sure? >> reporter: they did not sound like gun shots. they specifically sounded like what you would have with a concussion blast and then several smal...

Concussion blast and then several smaller sounds of what might be tear gas canisters being fired at a location. we can't see any of this going on. but i have heard the sounds before at other situations that i've been at. they sounded very familiar to me. and that's what it sounded like to me. but these were not gun shots that i was hearing. >> and, david, just to make sure we understand the reaction of the law enforcement that you've seen. i know you were describing that the ambulances were revving up their engines. but what else were you able to see from law enforcement that are standing wher...