toole. >> the facts are still coming out in this investigation, but you have risk factors here that we've seen in other cases. they're not the ones that determine violence. so you have the mental health history, but you also have that he had behavioral issues as well. most of these cases are almost certainly males and males in a saern age range. as they begin to pull back this individual and his background, they'll look for warning behaviors that could have occurred prior to the shooting. once we see the warning behaviors and which ones they are, we'll get a better idea of how he planned it and what his intentions were. >> right now, it doesn't look like this is a military story necessarily. what happened in 2009 obviously