Sports

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In this photo provided by The Daily Free Press and Kenshin Okubo, people react to an explosion at the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. (AP Photo/The Daily Free Press, Kenshin Okubo) MANDATORY CREDIT

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** FILE ** A firefighter tends to an injured man following an explosion near the finish line of the Boston Marathon in Boston, Monday, April 15, 2013. (AP Photo/Michael Dwyer)

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One of the blast sites on Boylston Street near the finish line of the 2013 Boston Marathon is investigated and guarded by police in the wake of two blasts in Boston Monday, April 15, 2013. (AP Photo/Elise Amendola)

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People react to a second explosion at the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts. (AP Photo/The Boston Globe, John Tlumacki)

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An unidentified Boston Marathon runner is comforted as she cries in the aftermath of two blasts which exploded near the finish line of the Boston Marathon in Boston, Monday, April 15, 2013. (AP Photo/Elise Amendola)

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A U.S. Parks Police officer with an assault rifle patrols the Washington Monument in Washington, DC., after a bombing at the Boston Marathon in Boston, Mass., April 15, 2013. (Andrew S Geraci/The Washington Times)

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Police have moved visitors to the north lawn of the White House back across the street as a precaution after bombs explode at the finish line of the Boston Marathon, Washington, D.C., Monday, April 15, 2013. (Andrew Harnik/The Washington Times)

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U.S. Parks Police with assault rifles patrol the Washington Monument in Washington, DC., after a bombing at the Boston Marathon in Boston, Mass., April 15, 2013. (Andrew S Geraci/The Washington Times)

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Police block off Pennsylvania Ave., from pedestrian traffic in front of the White House as a precaution after bombs explode at the finish line of the Boston Marathon, Washington, D.C., Monday, April 15, 2013. (Andrew Harnik/The Washington Times)

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President Barack Obama speaks in the James Brady Press Briefing Room at the White House in Washington, Monday, April 15, 2013, following the explosions at the Boston Marathon. (AP Photo/Charles Dharapak)

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Washington Capitals left wing Alex Ovechkin (8), of Russia, celebrates his goal with teammate Nicklas Backstrom (19), of Sweden, as Tampa Bay Lightning center Vincent Lecavalier (4) looks on at back right, during the second period of an NHL hockey game, Sunday, April 7, 2013, in Washington. (AP Photo/Nick Wass)

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Aerial view of the aftermath of the explosions near the finish line of the Boston Marathon. (Twitter phot: Bruce Mendelsohn)

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Medical workers aid an injured man at the 2013 Boston Marathon following an explosion in Boston, Monday, April 15, 2013. Two bombs exploded near the finish of the Boston Marathon on Monday, killing at least two people, injuring at least 22 others and sending authorities rushing to aid wounded spectators. (AP Photo/The Boston Globe, David L. Ryan)

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Medical workers aid an injured man at the finish line of the 2013 Boston Marathon following an explosion in Boston, Monday, April 15, 2013. Two bombs exploded near the finish of the Boston Marathon on Monday, killing two people, injuring 22 others and sending authorities rushing to aid wounded spectators, race organizers and police said. (AP Photo/Charles Krupa)