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This combination of images released by the FBI on Thursday show two images taken from surveillance video of who the FBI are calling suspect number 2 (left) in white cap, and suspect number 1 (right) in black cap, as they walk near each other through the crowd before the explosions at the Boston Marathon on Monday, April 15, 2013. (AP Photo/FBI)
A memento of flowers in a running shoe rests at a makeshift memorial in Boston's Back Bay neighborhood on Thursday a few blocks from the finish line of the Boston Marathon, where people continue to bring special objects to mourn and honor those who were killed and injured after two bombs exploded at the finish line of the race. (AP Photo/Craig Ruttle)
President Barack Obama attends the "Healing Our City: An Interfaith Service" at the Cathedral of the Holy Cross in Boston, Thursday, April 18, 2013. The service is dedicated to those who were gravely wounded or killed in Monday's bombing near the finish line of the Boston Marathon. (AP Photo/Susan Walsh)
This image released by the FBI on Thursday, April 18, 2013, shows in a image from video what the FBI is calling suspect number 2 with a white hat, highlighted, walking in Boston on Monday, April 15, 2013, before the explosions at the Boston Marathon. (AP Photo/FBI)