ภาพการแข่งขันบอสตันมาราธอน 2015

Boston Mayor Marty Walsh crowns Caroline Rotich of Kenya, after she won the women's division of the Boston Marathon, April 20, 2015.

Bill Richard, father of 2013 Boston Marathon bombing victim Martin Richard, prepares to put the victor's wreath on women's wheelchair division winner Tatyana McFadden of Russia, at the Boston Marathon, April 20, 2015.

Ethiopian Lelisa Desisa lifts his trophy after winning the Boston Marathon for the second time. Desisa won the marathon two years ago, donating the medal to the city of Boston in memory of the bombing victims, April 20, 2015.

Spectators pass through a security checkpoint near the finish line of the Boston Marathon, Boston, April 20, 2015

Runners cross the start line in the women's division of the Boston Marathon, in Hopkinton, April 20, 2015.

Marathon participant Christopher Snedecor of Somerville, MA goes through security as he arrives at the Boston Commons to board a bus that will bring him to the marathon starting line in Hopkinton, April 20, 2015.

Ejegayehu Dibaba leads the pack at the start of the 2015 Boston Marathon, Boston, MA, April 20, 2015.

Boston Marathon runner Tenee Ramsdell (left) gets a hug from Evangline Gersish, both from San Diego, before boarding a shuttle bus to the starting line in Hopkinton, MA, April 20, 2015.

Ernst Van Dyk, foreground, of South Africa, leads the start of the wheelchair division of the Boston Marathon, in Hopkinton, MA, April 20, 2015.

Runners and spectators crowd the finish line on Boyston Street, a day ahead of the 119th Boston Marathon in Boston, MA, April 19, 2015.