Rita Jeptoo of Kenya crosses the finish line to win the Women's Elite division of the 118th Boston Marathon in Boston, Massachusetts April 21, 2014. AFP PHOTO / Timothy A. CLARY
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Rita Jeptoo of Kenya celebrates with the trophy after winning the 118th Boston Marathon on April 21, 2014 in Boston, Massachusetts. Photo/Jim Rogash/Getty Images/AFP
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Mebrahtom "Meb" Keflezighi of the US crosses the finish line to win the Men's Elite division of the 118th Boston Marathon in Boston, Massachusetts April 21, 2014 . AFP PHOTO / Timothy A. CLARY
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2013 Boston Marathon Bombing survivors Celeste Corcoran (C) and her daughter Sydney Corcoran (R) react after crossing the finish line with Celeste's sister Carmen Acabbo on April 21, 2014 in Boston, Massachusetts. Photo/Jim Rogash/Getty Images/AFP
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A runner takes a selfie after crossing the finish line of the 118th Boston Marathon on April 21, 2014 in Boston, Massachusetts. Photo/Jim Rogash/Getty Images/AFP
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Team Hoyt crosses the finish line of the 118th Boston Marathon on April 21, 2014 in Boston, Massachusetts. Photo/Jim Rogash/Getty Images/AFP
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A runner crossing the finish line of the 118th Boston Marathon on April 21, 2014 in Boston, Massachusetts. Photo/Jim Rogash/Getty Images/AFP
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Handcycle division competitors cross the finish line of the 118th Boston Marathon on April 21, 2014 in Boston, Massachusetts. Photo/Jim Rogash/Getty Images/AFP
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A runner approaches the finish line of the 118th Boston Marathon on April 21, 2014 in Boston, Massachusetts. Photo/Jim Rogash/Getty Images/AFP