Deadly school shootings in U.S. history

Published On: Apr 02 2012 02:44:44 PM PDT   Updated On: Dec 12 2014 01:44:56 PM PST

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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Sept. 2, 2006: Douglas W. Pennington, 49, killed himself and his two sons, Logan P. Pennington, 26, and Benjamin M. Pennington, 24, during a visit to the campus of Shepherd University in Shepherdstown, W. Va.

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