Friday's shooting at an Oregon high school injured at least three students. Look back at major school shootings in U.S. history.
April 20, 1999: Students Eric Harris, 18, and Dylan Klebold, 17, killed 12 students and a teacher and wounded 23 before killing themselves at Columbine High School in Littleton, Colo.
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U.S. National Oceanic and Atmospheric Administration
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