Take a look at some of the worst mass shootings in U.S. history.
April 3, 2009: Gunman Jiverly Wong, 42, burst into a citizenship class at an immigration center in Binghamton, N.Y., killing 13 and wounding four before killing himself.
Boy Scouts of America
JASON REDMOND / Reuters
Library of Congress
iStock / amete
iStock / LawrenceSawyer
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