One year ago Monday, three people were killed and more than 200 injured in two explosions at the Boston Marathon. Take a look back at scenes from that day.
New York, Washington and other cities tightened security immediately after the explosions, according to CNN.
Enrique Castro-Mendivil / Reuters
U.S. National Archives
REUTERS/ Stefano Rellandini
U.S. Air Force
iStock / damircudic
Warner Bros. Television
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