With today's deadly school shooting in Nevada, 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.
Christian Hartmann, Mario Anzuoni/Reuters
REUTERS/San Lorenzo soccer club/Handout
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