Boston Marathon

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Boston Marathon bombing survivor Marc Fucarile cranks his hand-cycle as bombing hero Carlos Arredondo, right, walks at his side during the Tribute Run on Boston Marathon weekend, Saturday, April 19, 2014 in Boston. Fucarile lost his right leg in the blast outside the restaurant. The 118th Boston Marathon is scheduled to run on Patriots Day, Monday, April 21. (AP Photo/Charles Krupa)

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Runners approach the finish line of the Boston Marathon, a midpoint of a 5K race, on Boston Marathon weekend, Saturday, April 19, 2014 in Boston. The 118th Boston Marathon is scheduled to run on Patriots Day, Monday, April 21. (AP Photo/Charles Krupa)

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Sallie Wambui, of Kenya, displays her country's flag Saturday, April 19, 2014, along Boylston Street in Boston, in advance of Monday's 118th Boston Marathon. (AP Photo/Robert F. Bukaty)

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Boston Marathon runners Meb Keflezighi and Ryan Hall applaud during introductions at a media availability of Boston Marathon elite runners at the Copley Plaza Hotel in Boston Friday April 18, 2014. The 118th running of the Boston Marathon is Monday April 21, 2014. (AP Photo/Stephan Savoia)

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Molly Huddle, of Providence, R.I., breaks the tape to win the women's division in the 5-kilometer run Saturday, April 19, 2014, in Boston in advance of Monday's 118th Boston Marathon. (AP Photo/Elise Amendola)

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Dejen Gebremeskel, left, of Ethiopia, breaks the tape ahead of Ben True, of Hanover, N.H., to win the 5-kilometer run Saturday, April 19, 2014, in Boston, in advance of Monday's 118th Boston Marathon. (AP Photo/Elise Amendola)