Of Horror and Heroism: A Photographer's Story in Pictures

By Kelvin Ma - 2013-04-22T01:51:35Z

Kelvin Ma/Bloomberg

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First Responders

First responders tend to the wounded where two explosions occurred along the final stretch of the Boston Marathon on Boylston Street in Boston, Massachusetts, U.S., on Monday, April 15, 2013. Two powerful explosions rocked the finish line area of the Boston Marathon near Copley Square and police said many people were injured.

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