student and one injured staff member. of course, the police -- arlington police said we were looking at three injured people in hospitals. so a bit of a discrepancy there. hopefully that's something we can get clarified but information can be a little bit hard to come by. i want to bring in a national security contributor here at nbc news. frank, this seems like a fairly straightforward case based on what we know from the local police department here. what steps are investigators, what steps are, you know, local police, the federal and state agencies that get involved in a case like this, what steps are they taking now to piece this together, make sure they're looking for the right person. >> there's a couple of things happening simultaneously. first, there will be interviews done, interview teams will be set up among law enforcement. anyone who knew of these students or the people involved