Take a look at some of the worst mass shootings in U.S. history.
March 10, 2009: Michael McLendon, 28, is accused of killing 10 people in several towns in Alabama before killing himself. The dead included several family members, including his mother and grandparents.
Library of Congress
Auction Team Breker
Chuck Kennedy/The White House
Boy Scouts of America
JASON REDMOND / Reuters
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