trying to find anyone who may have escaped or helped them, of course. this is going to be critical in the investigation. the worst of the carnage as i was mentioning at the top of the hour, happened at the see this ter. two police vans are in front of the concert hall. i spoke with one of the police officers here. is he told me forensic vehicles are taking them away to the medical examiner's office, eventually to the morgue. this is where four gunmen held people hostage, brutally firing into the crowd, slaughtering some 80 people on the ground, those running shot in the back, shot while they were laying on the floor and incredible new images are coming into cnn by the way. it shows concert-goers fleeing from a back exit. can you hear gunfire ring out. let's take a listen, take a look at some of this footage.