Look back at Boston Marathon bombing

Published On: Apr 15 2013 01:24:15 PM PDT   Updated On: Apr 15 2014 06:20:13 AM PDT

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.

Boston Marathon explosion
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New York, Washington and other cities tightened security immediately after the explosions, according to CNN.

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