Friday's shooting at an Oregon high school injured at least three students. Look back at major school shootings in U.S. history.
On Oct. 24, 2014, 15-year-old freshman Jaylen Fryberg shot five other students at Marysville Pilchuck High School in Marysville, Washington, before turning the gun on himself. Fryberg and four of the other students were killed. Here's a look back at other major school shootings in U.S. history.
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