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Reports of serious and severe injuries are coming in after two explosions rocked the finish line of the Boston Marathon. Witnesses say the two explosions were separated by two minutes. Local hospitals have been told to be prepared to receive numerous casualties and to raise their alert levels. Witnesses have also said that they saw some participants without limbs following the blast. It is still not clear how or why this explosion happened. 

The below is a photo taken by someone at the marathon of one of the explosions at the finish line of the Boston Marathon.