joining me now is clint va van zandt, a former f.b.i. profiler and an nbc news analyst.nt, thanks for being here tonight. >> good to be with you, al. >> what are officials doing right now to try to advance this investigation? what are they looking for? >> al, as you know, they've got multiple crime scenes. they've got to horrific scene at the school where every law enforcement officer, the first responder goes in, i'm sure the tendency breaks down in tears because that could be their children or grandchildren. you've got that crime scene they have to deal with. and then you've got the separate crime scene of the victim's mother's home where we're told that she was shot in the face and killed. we've got that crime scene. and then you've got any location where the subject may have lived with roommates, his vehicle and law enforcement also has a race going on, al. and that race says make sure there's not any other event. we know, for example, that the connecticut state police bomb squad was going to each location to make sure there hadn't been an explosive device, a bomb, s