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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Doctors at Work

First responders tend to the wounded, including a young boy in a wheelchair, 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.