Deadly school shootings in U.S. history

Published On: Apr 02 2012 04:44:44 PM CDT   Updated On: Nov 27 2014 11:21:46 AM CST

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

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National Archives and Records Administration

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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