bringing back retired special agent bobby chicon, the person that reporter was talking to they are standing outside of festival ground waiting to go back in to get their stuff, there are still concerns there might be other gunmen out there. talk about this. the chance that the gunman could have left. >> you have to set your perimeter as wide as you can. get everyone out, sometimes it is a natural perimeter, you work with geography that you have. you start with crime scene. you go as wide as you can . we had afternoo incident like tu have to practice. reunite family quickly, so you know if there are additional victims. that all happening right now. that is really hard task, very stressful, it takes' lot of cooperation among different levels of government. you have to come together as a community, you know, detectives looking at if there are three unfortunately three diseases people, look at those victims are they related. did someone have a reason to harm any of them. you try to rule out if it was a directed shooting. a lot of things happening at the same time, very little pictures have been