from dealing with pycho paths in your career, what's the purpose of doing that? he trying to kill more people, trying to scare people? why was he doing this? >> at the minimum, he's tried to scare people and he's done it. he's made the authorities very leery of going in. you have several buildings evacuated. people are displaced and homeless because of him. that's the minimum. if he had the capability and did wire it up to explode, then obviously he's looking to kill the police and the agents who go to conduct the crime scene investigation. it would have been set up for them to be harmed or killed as soon as they entered that apartment. so that we don't know. as i said, you won't know for sure if the explosives experts determine and they may find out the hard way, unfortunately, that he did have the capability and did in fact, wire that place up to explode. >> tom fuentes, thank you. >>> one man, three deadly minutes. that's all it took to kill 12 people and injure 58 others. i will speak with a firearms expert about just how powerful those guns were. that's comi