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Timeline: Deadly school shootings since Columbine

USATODAY

Shelby Davis, 5, whose brother Michael was a student of Assistant Principal Ken Bruce, places flowers in the fence at the entrance to Campbell County Comprehensive High School in Jacksboro, Tenn. Bruce was killed Tuesday by a student at the school. The Principal and another assistant principal were injured in the incident.

April 20, 2014 marks the 15th anniversary of the shooting rampage that killed 13 at Columbine High School in Littleton, Colo. Look back at other deadly shootings at U.S. schools and college campuses.

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