Take a look at some of the worst mass shootings in U.S. history.
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.
Boy Scouts of America
JASON REDMOND / Reuters
Library of Congress
iStock / amete
iStock / LawrenceSawyer
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