Boston Bombings 'Not the Work of an Amateur'

Boston Bombings 'Not the Work of an Amateur' : Discovery News: "Who did it? That's the question on everyone's mind after two explosions at the finish line of the Boston Marathon on Monday killed three and injured as many as 100 people. Boston police say they uncovered two additional homemade bombs that were also set to go off. There also was an explosion at the JFK Library just south of downtown Boston that may or may not have been related to the others."