S.W.A.T. team members stand guard on the campus of Massachusetts General Hospital following an explosion at the finish line of the Boston Marathon in Boston, Monday, April 15, 2013. (AP Photo/Michael Dwyer)
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S.W.A.T. team members stand guard on the campus of Massachusetts General Hospital following an explosion at the finish line of the Boston Marathon in Boston, Monday, April 15, 2013. (AP Photo/Michael Dwyer)
