Take a look at some of the worst mass shootings in U.S. history.
Sources say close to 30 people were killed, many of whom were children, during a school shooting the Sandy Hook Elementary School in Newton, Conn.
istock
Library of Congress
Fred Prouser/Reuters
REUTERS/Richard Rowe
Dan Jackson
Brendan McDermid/Reuters
Boy Scouts of America
JASON REDMOND / Reuters
Ed Zurga/Reuters
Rebecca Vitsmun/iReport
Madi Alexander
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iStock
Universal Pictures
TriviaKing/Wikimedia Commons
Jim Castel/CNN
iStock / amete
Mario Anzuoni/Reuters
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Phil McCarten/Reuters
iStock / LawrenceSawyer
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