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.
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.
From Family Photos/CNN
John Stillwell/Royal Family
Russian Federal Space Agency
iStock / rojoimages
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