Boston Marathon

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Donny Sazama, of Hermantown, Minn., carries an American flag as he runs past the 26 mile mark of the 118th Boston Marathon Monday, April 21, 2014 in Boston. (AP Photo/Robert F. Bukaty)

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Boston Marathon bombing survivor Marc Fucarile hugs former Red Sox player Kevin Millar after throwing out the ceremonial first pitch before the baseball game between the Boston Red Sox and the Baltimore Orioles at Fenway Park in Boston Monday, April 21, 2014. (AP Photo/Winslow Townson)

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Boston Marathon husband and wife bombing survivors Patrick Downes and Jessica Kensky, who each lost a leg in last year's bombings, roll across the finish line in the 118th Boston Marathon Monday, April 21, 2014 in Boston. (AP Photo/Elise Amendola)

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Rita Jeptoo, of Kenya, celebrates her win in the women's division of the 118th Boston Marathon, Monday, April 21, 2014, in Boston. (AP Photo/Elise Amendola)

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Rita Jeptoo, of Kenya, hoists the trophy after winning the women's division of the 118th Boston Marathon Monday, April 21, 2014 in Boston. (AP Photo/Elise Amendola)

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Meb Keflezighi, of San Diego, Calif., raises his fist as he competes in the 118th Boston Marathon Monday, April 21, 2014 in Newton, Mass. (AP Photo/Steven Senne)