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Boston Marathon runner Russell Clifford of Marlborough, Mass. walks past SWAT officers near the finish line of the Boston Marathon in Boston Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts.
(AP Photo/Winslow Townson)