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.
Boy Scouts of America
Ed Zurga/Reuters
JASON REDMOND / Reuters
Rebecca Vitsmun/iReport
Madi Alexander
ulocal mobile
istock
iStock
Library of Congress
Universal Pictures
TriviaKing/Wikimedia Commons
Jim Castel/CNN
Dan Jackson
iStock / amete
Mario Anzuoni/Reuters
iStock image
Phil McCarten/Reuters
iStock / LawrenceSawyer
Jim Young/Reuters
Chuck Hadad/CNN
REUTERS
Mark Hill/CNN
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