Mass shootings in U.S. history

Published On: Jul 20 2012 09:20:30 AM CDT   Updated On: Mar 10 2014 02:13:18 PM CDT

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

Aaron Alexis, Navy Yard suspect
3 / 17
FBI.gov

Sept. 16, 2013: Authorities say military contractor Aaron Alexis gunned down 12 people and wounded eight others at the Washington Navy Yard before he was killed.

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