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Two people have been killed and at least 100 injured after two explosions occured at the finish line of the Boston Marathon. Some of those injured have lost limbs in the blasts. A third explosion was reported outside the JFK library in the city.
The explosions happened at 2:45pm local time, two hours after the first of the 27,000 competitors crossed the finish line.
Authorities say they knew of no security threats prior to the marathon, and are investigating the attack. Washington DC and New York have been placed on high alert.