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PHOTOS: Mason Campbell, the 12-Year-Old Shotgun-Wielding School Shooting Suspect

The gunfire broke out in a crowded gymnasium where students were milling around waiting for classes to begin. It's reported that three rounds were fired, one at the floor, one at the ceiling and the final into the bleachers were students were sitting.

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Mason Campbell, 12, is the main suspect in the Berrendo Middle School shooting. Campbell is accused of shooting two students with a sawed-off shotgun.