UCF Student's Massacre Plot Foiled: Roommate's 911 Call

We see the pictures that show how close this nation came to another school massacre. We told you last night about the bullets and bombs amassed by a student at the University of Central Florida in... See More

We see the pictures that show how close this nation came to another school massacre. We told you last night about the bullets and bombs amassed by a student at the University of Central Florida in Orlando and tonight. We tracked down the roommate credited with making the 911 call that may have saved the campus. ABC's -- tuchman is there -- Tonight the first video from police cameras. Tracking down he would be killer body got a camera showing the moment -- with assault rifles. Discovered the body of -- all receive the -- along with his arsenal mass murder. In the background that fire alarm police say the shooter set it off. -- -- to get students in the hallway and slaughter them. The suspected shooter pulled the fire -- down went back into his shooting here. Then he grabbed his -- apparently he went after one of his roommates who then slid into the bathroom and that roommate rob about -- -- called 911. -- -- -- Arms and got a -- now. We spoke to him today you -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- Police say -- -- helped prevent a massacre. Police say -- Cooper and left behind a check to play I think every step of the attack as he did each thing actually scratched -- off on the list. So that was and the -- stops with -- firearm he had amassed an arsenal -- delegates -- and massive clips -- we learned tonight it could have been much worse people packages were found in the college -- What I was in the mail waiting -- the deceased. Were. Two. The 22 round magazines there was also a Blackhawk technical slaying and there was also a training -- In a short statement -- -- -- -- parents say their son was a -- What had no history of violence. Matt Gutman ABC news Orlando. And tonight Matt tells us that at this hour the motive is still a complete mystery.