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Boston bombings: a view of the second explosion, facing east down Boylston Street and Copley Square, near the finish line of the Boston Marathon, in Boston, Massachusetts, April 15, 2013 (Credit: Dan Lampariello via Twitter)

Boston bombings: a view of the second explosion, facing east down Boylston Street and Copley Square, near the finish line of the Boston Marathon, in Boston, Massachusetts, April 15, 2013 (Credit: Dan Lampariello via Twitter)