Police help a runner after multiple explosions rocked the finish line of the Boston Marathon on Monday, April 15, 2013, in Boston, Massachusetts.
Police help a runner after multiple explosions rocked the finish line of the Boston Marathon on Monday, April 15, 2013, in Boston, Massachusetts. MCT
Police help a runner after multiple explosions rocked the finish line of the Boston Marathon on Monday, April 15, 2013, in Boston, Massachusetts. MCT

Boston bombing probe involves ‘voluminous tips,’ painstaking detail

April 16, 2013 6:05 PM