With Tuesday's school shooting in Oregon, look back at other major school shootings in U.S. history.
Feb. 14, 2008: A former Northern Illinois University graduate student walked onto the stage of a science lecture hall and opened fire, injuring at least 15 students. Six students were killed in the attack before the shooter took his own life.
Enrique Castro-Mendivil / Reuters
U.S. National Archives
REUTERS/ Stefano Rellandini
U.S. Air Force
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Warner Bros. Television
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