In this Monday, April 15, 2013 photo, a race official assists Bill Iffrig, 78, of Lake Stevens, Wash., as Iffrig lies on the ground after the first explosion, as police officers react to a second explosion at the finish line of the Boston Marathon in Boston, Monday, April 15, 2013.  Iffrig, of Lake Stevens, Wash., was running his third Boston Marathon and near the finish line when he was knocked down by one of two bomb blasts. (AP Photo/MetroWest Daily News, Ken McGagh)  MANDATORY CREDIT
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