With today's deadly school shooting in Nevada, look back at other major school shootings in U.S. history.
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.
Seoul National University/Handout/Reuters
Lucy Richardson/ Reuters
iStock / gbh007
National Portrait Gallery, London
iStock / mashabuba
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