Look back at Boston Marathon bombing

Published On: Apr 15 2013 03:24:15 PM CDT   Updated On: Apr 30 2014 08:01:49 PM CDT

The trial for Dzhokhar Tsarnaev, the man charged in the Boston Marathon bombings that killed three people and injured more than 200, begins Monday. Take a look back at scenes from the April 15, 2013, incident.

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Mark Wilson/Getty Images

member of the U.S. Secret Service stands watch on Pennsylvania Avenue in front of the White House in Washington, D.C., after its flag was lowered to half-staff to honor the victims of the attack on the Boston Marathon.

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