Take a look at some of the worst mass shootings in U.S. history.
March 29, 2009: A gunman killed five family members, including his two children, and wounded his wife at a townhome in Santa Clara, Calif., before killing himself.
Library of Congress
iStock / amete
iStock / LawrenceSawyer
Wisconsin Dept. of Natural Resources
Enrique Castro-Mendivil / Reuters
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