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Kavanaugh, former fbi negotiator, jim, tell us now how do they determine just what the response should be and whether or not there's any way of negotiating or finding out who this person is and presumably it's only one person. >> right, andrea. the protocol is to locate, isolate and then evacuate. they are going to try to locate the shooter and isolate him in this same moments and also trying to evacuate people. if students have locked themselves down, police will try to push the shooter into a certain room location where it's only him. you know, they've got to get him stopped and isolated bef...

We talking about with the boulevard being shut down while the ballistics are there? >> we have most of las vegas boulevard open. directly adjacent to the mandalay remains closed. we will ensure we go out to the proper intersections to limit the hindrance of traffic. we are looking at a minimum of 12 additional hours for documentation of this crime scene and the removal of the bodies. >> do you know how long he was able to shoot for and do you happen to know if there was return fire from officers on the ground? >> no. i'm not aware of return fire or the timeline. but we did have s.w.a.t. office...