Mass shootings in U.S. history

POSTED: 07:20 AM PDT Jul 20, 2012    UPDATED: 08:23 AM PDT Aug 24, 2012 

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

Nidal Hasan
7 / 25
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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