** FILE ** Massachusetts Gov. Deval Patrick pauses as he speaks about the explosions during a news conference as Boston Police Commissioner Edward Davis, left, looks on, Monday, April 15, 2013, in Boston. Two explosions shattered the finish of the Boston Marathon. (AP Photo/Bizuayehu Tesfaye)

** FILE ** Massachusetts Gov. Deval Patrick pauses as he speaks about the explosions during a news conference as Boston Police Commissioner Edward Davis, left, looks on, Monday, April 15, 2013, in Boston. Two explosions shattered the finish of the Boston Marathon. (AP Photo/Bizuayehu Tesfaye)