Take a look at some of the worst mass shootings in U.S. history.
Sept. 5, 1949: World War II veteran Howard Unruh, 28, shot and killed 13 neighbors in Camden, N.J. He was committed to a state mental institution.
Library of Congress
iStock / amete
iStock / LawrenceSawyer
Wisconsin Dept. of Natural Resources
Enrique Castro-Mendivil / Reuters
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