Emergency personnel assist the victims at the scene of a bomb blast during the Boston Marathon in Boston, Massachusetts, Monday, April 15, 2013. (Stuart Cahill/Boston Herald/MCT)
Victims of the bomb blast during the Boston Marathon are assisted in Boston, Massachusetts, Monday, April 15, 2013. (Stuart Cahill/Boston Herald/MCT)
Emergency personnel assist the victims at the scene of a bomb blast during the Boston Marathon in Boston, Massachusetts, Monday, April 15, 2013. (Stuart Cahill/Boston Herald/MCT)
Emergency personnel assist the victims at the scene of a bomb blast during the Boston Marathon in Boston, Massachusetts, Monday, April 15, 2013. (Stuart Cahill/Boston Herald/MCT)