Twin blasts rock Boston

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Investigators at the scene of a double bombing at the Boston Marathon have found two unexploded bombs. The clue might help the Federal Bureau of Investigation determine who was behind the attack for which no one and no group has claimed responsibility. The blasts killed three people and injured more than 100 others when they ripped through the crowd at the finish line of the international event. Al Jazeera's Alan Fisher reports from Boston.

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