the shooter got into that room and had explosive devices at the same time. what does that say to you? >> so many unanswered questions. obviously one of the first questions they'll have is how did this person gain entry? was he supposed to be there? did he have a lawful presence in the location? or was he someone who came in off the street, maybe he had some kind of grievance, obviously a lot of unanswered questions that are there. it shows this level of depravity when you add these explosive devices. it's interesting that we don't see these detonating, so it's really tough to put yourself in the mindset of one of these types of mass killers, someone who goes in there with the intent on causing harm, but so many questions as you see the level of planning and sophistication with having devices, yet not employing those. again, there are a lot of unanswered questions investigators will have to look at here. >> local police on the scene. they're describing these explosive devices that were found at the school off campus