A 911 call from a student at the University of Central Florida and a quick response by campus police may have prevented a mass murder.

Campus police said Monday that 30-year-old James Oliver Seevakumaran -- who shot himself in the head as officers arrived, before any other students were hurt -- was heavily armed with two guns, hundreds of rounds of ammunition, a backpack filled with explosives and a plan to attack other students as they fled the seven-story dorm where he lived.

Seevakumaran's roommate, who hid in a bathroom after Seevakumaran pointed a gun at him, called authorities about the incident, UCF Police Chief Richard Beary said.

Around the same time, Seevakumaran pulled a fire alarm, apparently to get other students out in the open, the police chief said.
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