Take a look at some of the worst mass shootings in U.S. history.
Aug. 20, 1986: Postal worker Pat Sherrill, 44, shot 14 at a post office in Edmond, Okla., before killing himself.
CNN Exclusive/Richard Dessin
Danny Moloshok / Reuters
Boy Scouts of America
Karen Barefoot/SXC
Library of Congress
Ki Price/Reuters
Lucas Jackson/Reuters
Pool
Kevin Taverner/CNN
Auction Team Breker
Chuck Kennedy/The White House
istock
Fred Prouser/Reuters
REUTERS/Richard Rowe
Dan Jackson
Brendan McDermid/Reuters
JASON REDMOND / Reuters
Ed Zurga/Reuters
Rebecca Vitsmun/iReport
Madi Alexander
ulocal mobile
iStock
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