possibly eyewitnesses may have seen some kind of activity involving that van before that van careened into a crowd. so talk to me about the importance of what people are saying about what happened just prior to this incident and even in the midst of. >> right. so what people are seeing, saying, excuse me, is often less reliable than, you know, the pictures, any videos, things like that. because, remember, when you're in a crisis like this, your viewpoint is only from the position that you're in. it's why eyewitness accounts tend to be unreliable during an attack like this. so the investigators are going to essentially begin with not just interviewing people what did you see, how many people, and try to get validity or some sen krus of the crowd so to speak. did enough people see a bag or whatever he was doing to give