Mass shootings in U.S. history

Published On: Jul 20 2012 09:20:30 AM CDT   Updated On: Aug 24 2012 10:23:52 AM CDT

Take a look at some of the worst mass shootings in U.S. history.

Nidal Hasan
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Handout . / Reuters

Nov. 5, 2009: Major Nidal Hasan, a psychologist with the U.S. Army, is accused of killing 13 soldiers and wounding 42 others at a base in Fort Hood, Texas.

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