Deadly school shootings in U.S. history

Published On: Apr 02 2012 04:44:44 PM CDT   Updated On: Dec 12 2014 03:44:56 PM CST

Friday's shooting at an Oregon high school injured at least three students. Look back at major school shootings in U.S. history.

KENT STATE SHOOTINGS
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Reuters Photographer / Reuters

May 4, 1970: Four students were killed and nine wounded by National Guard troops called in to quell anti-war protests on the campus of Kent State University in Ohio.

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