The Boston Marathon

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Survivors of the Boston Marathon bombings walk onto the field before the Boston Red Sox's baseball home-opener against the Milwaukee Brewers at Fenway Park in Boston, Friday, April 4, 2014. (AP Photo/Michael Dwyer)

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Boston Red Sox's David Ortiz greets Carlos Arredondo, center, and other victims of the Boston Marathon bombing and their family members during pre-game ceremonies before a baseball game against the Milwaukee Brewers on Opening Day at Fenway Park in Boston, Friday, April 4, 2014. (AP Photo/Michael Dwyer)

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FILE - In this April 19, 2013 file photo, police in tactical gear surround an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass. A Harvard University report released Thursday, April 3, 2014, on the response to the bombings was largely positive, but criticized law enforcement for the chaotic gunfight in which one suspect was killed and a police officer seriously injured, because it lacked coordination. (AP Photo/Charles Krupa, File)

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A Saudi Arabian man injured in the Boston Marathon bombings on March 28 filed a defamation lawsuit against Glenn Beck, accusing the conservative TV and radio commentator of saying on the air that the plaintiff was "the money man" behind the attack. (Associated Press)

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** FILE ** In this May 7, 2013, file photo, Kevin Brown, of Boston, right, places a Teddy bear at a makeshift memorial to the victims of the April 15, 2013, bombings near the Boston Marathon finish line in Boston's Copley Square. (AP Photo/Steven Senne, File)

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Boston Marathon bombing survivor Karen Rand speaks during a panel entitled, "Healing a City: Lessons from the Boston Marathon Survivor Community" held at Boston University in Boston, Monday, March 24, 2014. (AP Photo/Elise Amendola)