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A solitary runner heads down the banks of the Charles River in Cambridge, Mass., in front of the Boston skyline, at dawn the morning after explosions killed three and injured more than 140 at the Boston Marathon, Tuesday, April 16, 2013. The bombs that blew up seconds apart at the finish line of one of the world's most storied races left the streets spattered with blood and glass, and gaping questions of who chose to attack at the Boston Marathon and why. (AP Photo/Charles Krupa)

Boston deals with aftermath

Two bomb explosions killed three and injured more than 140 at the Boston Marathon, April 15. The bombs left a city forever changed, and people putting the pieces back together after the brutal chapter comes to a close.