this is something they are going to be looking into and find out. >> fst just incredible. the undersheriff that we interviewed, he was saying usually much bigger crowd scenes. they are used to 25,000 there. they know how to manage it and they have emergency drills. everybody does simulations of worse case scenarios. this is beyond the scope of what they could have imagined or planned for. >> that's right. there's a set protocol for searching bags. the buildings that rise above such that they can be the subject of sniper fire like this. >> this woman who was the person of interest, we're finding more about her. she was a person of interest overnight. police made contact with her. they are saying they don't believe she was connected in in way to the shooting. now i'm getting an alert from our people here saying they believe she was out of the ko