Take a look at some of the worst mass shootings in U.S. history.
Jan. 8, 2011: Jared Lee Loughner is accused of killing six and wounding at least 12, including then-Rep. Gabrielle Giffords, outside a grocery store in Tucson, Ariz.
Library of Congress
Boy Scouts of America
JASON REDMOND / Reuters
iStock / amete
iStock / LawrenceSawyer
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