Look back at Boston Marathon bombing

Published On: Apr 15 2013 03:24:15 PM CDT   Updated On: Apr 15 2014 08:20:13 AM CDT

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.

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U.S. Secret Service agents walk around the White House complex in Washington, D.C., after several explosions struck the Boston Marathon as runners crossed the finish line.

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