Runners make their way to the finish line during the 118th Boston Marathon in Boston, Massachusetts April 21, 2014. (Photo: TIMOTHY A. CLARY/AFP/Getty Images)
118th Boston Marathon
Shalane Flanagan runs in the Boston Marathon on April 21, 2014 in Boston, Massachusetts. (Photo by Andrew Burton/Getty Images)
118th Boston Marathon
Meb Keflezighi of the United States celebrates with the tophy after winning the 118th Boston Marathon on April 21, 2014 in Boston, Massachusetts. (Photo by Jim Rogash/Getty Images)
118th Boston Marathon
People cheer as Meb Keflezighi, an American, wins the Boston Marathon on April 21, 2014 in Boston, Massachusetts. (Photo by Andrew Burton/Getty Images)
118th Boston Marathon
Rita Jeptoo of Kenya celebrates with the trophy after winning the 118th Boston Marathon on April 21, 2014 in Boston, Massachusetts. (Photo by Jim Rogash/Getty Images)
118th Boston Marathon
Rita Jeptoo of Kenya(Bottom-C) crosses the finish line to win the Women's Elite division of the 118th Boston Marathon in Boston, Massachusetts April 21, 2014. (photo: TIMOTHY A. CLARY/AFP/Getty Images)
118th Boston Marathon
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. (Photo: TIMOTHY A. CLARY/AFP/Getty Images)
118th Boston Marathon
The Elite Men's division starts the 118th Boston Marathon on April 21, 2014 in Hopkinton, Massachusetts. (Photo by Alex Trautwig/Getty Images)
118th Boston Marathon
Rita Jeptoo of Kenya crosses the finish line to win the 118th Boston Marathon on April 21, 2014 in Boston, Massachusetts. (Photo by Jim Rogash/Getty Images)
118th Boston Marathon
Runners wait for the start gun at the beginning of the Boston Marathon on April 21, 2014 in Hopkington, Massachusetts. (Photo by Andrew Burton/Getty Images)
118th Boston Marathon
Ernst van Dyke celebrates after he won the men's wheelchair division of the 2014 B.A.A. Boston Marathon on April 21, 2014 in Boston, Massachusetts. (Photo by Jim Rogash/Getty Images)
118th Boston Marathon
Runners wait for the start gun at the beginning of the Boston Marathon on April 21, 2014 in Hopkington, Massachusetts. (Photo by Andrew Burton/Getty Images)
118th Boston Marathon
A runner gives a high five at the beginning of the Boston Marathon on April 21, 2014 in Hopkington, Massachusetts. (Photo by Andrew Burton/Getty Images)
118th Boston Marathon
Haven Novack, age 8, of Boxford, MA, waves a 'Boston Strong' flag at the beginning of the Boston Marathon on April 21, 2014 in Hopkington, Massachusetts. (Photo by Andrew Burton/Getty Images)
118th Boston Marathon
Meb Keflezighi of the United States runs down Boylston Street before finishing in first place to win the 2014 B.A.A. Boston Marathon on April 21, 2014 in Boston, Massachusetts. (Photo by Jared Wickerham/Getty Images)
118th Boston Marathon
Runners cheer at the end of the singing of the National Anthem at the beginning of the Boston Marathon on April 21, 2014 in Hopkington, Massachusetts. (Photo by Andrew Burton/Getty Images)
118th Boston Marathon
Tatyana McFadden of the US, poses with her medal atfer winning the Women's Push Rim Wheelchair division of the 118th Boston Marathon in Boston, Massachusetts April 21, 2014. (photo: TIMOTHY A. CLARY/AFP/Getty Images)
118th Boston Marathon
A runner with a temporary Boston Marathon tattoo gets ready to run the 118th Boston Marathon in the Boston Commons on April 21, 2014 in Boston, Massachusetts. (Photo by Andrew Burton/Getty Images)
118th Boston Marathon
Runners place their hands over their hearts during a singing of the National Anthem at the beginning of the Boston Marathon on April 21, 2014 in Hopkington, Massachusetts. (Photo by Andrew Burton/Getty Images)
118th Boston Marathon
Fans hold 'Boston Strong' flags prior to the start of the 118th Boston Marathon on April 21, 2014 in Hopkinton, Massachusetts. (Photo by Alex Trautwig/Getty Images)
118th Boston Marathon
Shalane Flanagan warms up before the Elite Women's division starts the 118th Boston Marathon on April 21, 2014 in Hopkinton, Massachusetts. (Photo by Alex Trautwig/Getty Images)
118th Boston Marathon
Runners place their hands over their hearts during a singing of the National Anthem at the beginning of the Boston Marathon on April 21, 2014 in Hopkington, Massachusetts. (Photo by Andrew Burton/Getty Images)
118th Boston Marathon
Volunteers look on as Wave 1 starts the 118th Boston Marathon on April 21, 2014 in Hopkinton, Massachusetts. (Photo by Alex Trautwig/Getty Images)
118th Boston Marathon
The Elite Women's division starts the 118th Boston Marathon on April 21, 2014 in Hopkinton, Massachusetts. (Photo by Alex Trautwig/Getty Images)
118th Boston Marathon
A father carrying his son on his shoulder watches the scene at the starting line of the Boston Marathon on April 21, 2014 in Hopkington, Massachusetts. (Photo by Andrew Burton/Getty Images)
118th Boston Marathon
People bow their heads during a moment of silence prior to the start of the Boston Marathon on April 21, 2014 in Hopkington, Massachusetts. (Photo by Andrew Burton/Getty Images)
118th Boston Marathon
Members of the Push Rim Wheelchair division start the 118th Boston Marathon on April 21, 2014 in Hopkinton, Massachusetts. (Photo by Alex Trautwig/Getty Images)
118th Boston Marathon
Volunteers look on during a flyover by the Massachusetts Army National Guard members of “C” Company, 3rd of the 126th General Support Aviation Battalion before the start of the 118th Boston Marathon on April 21, 2014 in Hopkinton, Massachusetts. (Photo by Alex Trautwig/Getty Images)
118th Boston Marathon
A police K-9 patrols the finish line area prior to the start of the 118th Boston Marathon in Boston, Massachusetts April 21, 2014. (Photo credit TIMOTHY A. CLARY/AFP/Getty Images)
118th Boston Marathon
A Massachusetts State Police officer stands guard prior to the start of the Boston Marathon on April 21, 2014 in Hopkington, Massachusetts. . (Photo by Andrew Burton/Getty Images)
118th Boston Marathon
Two police officers look on from a rooftop near the start area of the 118th Boston Marathon on April 21, 2014 in Hopkinton, Massachusetts. (Photo by Alex Trautwig/Getty Images)
118th Boston Marathon
A few people run along Boylston Street near the 26 mile marker prior to the start of the 2014 B.A.A. Boston Marathon on April 21, 2014 in Boston, Massachusetts. (Photo by Jared Wickerham/Getty Images)
118th Boston Marathon
Fans cheer prior to the start of the 118th Boston Marathon on April 21, 2014 in Hopkinton, Massachusetts. (Photo by Alex Trautwig/Getty Images)
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