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Heating plant, the closets, the classrooms, any place they could still be hiding not knowing what's going on. >> so they're going room by room, closet by closet. th then they're trying to track the shooter, then you have a separate crime scene of the shooter's residence. is there more information to be gleaned there? and they'll look at, does he have a twitter account, a facebook account, anywhere where he's been e-mailing or texting others, that maybe if not involved, aware of what his intentions were that he might want to do this. they're trying to talk to every friend, relative, neighbor, c...

Be that he missed. we don't know that. >> that's for sure. so this is a very large building. 3,000 people work inside building 197. some people, some employees are still in there, locked in closets, locked in their offices. some people managed to escape. the gunman is still inside. so what does it look like inside that building from a police perspective, tom? >> oh, it's a very difficult situation because if the person is locked in a closet, the police are going to have to go either now or later are going to have to go room by room, closet by closet, air duct by air duct to see if there's anyb...

This was at 4:48 so less than 20 minutes ago when police took this action and the gunman was shot. >> brianna, stand by. tom fuentes is joining us, a former assistant fbi director and cnn contributor. it looks like this is over with right now unless you have a different assumption, tom. >> it would appear so, wolf. of course it's going to take probably several hours to go through the entire building room by room, closet by closet, to not only make there are no other devices but also to make sure there aren't other office workers hiding somewhere not knowing what's going on, not knowing if it's...