Boston Marathon

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MBTA police officer Richard Donohue, left, hugs Boston Red Sox's David Ortiz as Boston Marathon bombings survivor Heather Abbott, center, stands nearby before the Red Sox's baseball homer-opener against the Milwaukee Brewers at Fenway Park in Boston, Friday, April 4, 2014. (AP Photo/Michael Dwyer)

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Boston Marathon bombing hero Carlos Arredondo gives a thumbs-up as he walks on the field during pre-game ceremonies before a baseball game in between the Boston Red Sox and the Milwaukee Brewers on Opening Day at Fenway Park in Boston, Friday, April 4, 2014. (AP Photo/Michael Dwyer)

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Boston Marathon bombing victims and family members walk in from left field during pre-game ceremonies before a baseball game between the Boston Red Sox and the Milwaukee Brewers on Opening Day at Fenway Park in Boston, Friday, April 4, 2014. (AP Photo/Michael Dwyer)

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Boston Marathon survivors, friends and family walk onto the field at Fenway Park in Boston, Friday, April 4, 2014, during opening day ceremonies prior to a baseball game between the Boston Red Sox and the Milwaukee Brewers. (AP Photo/Elise Amendola)

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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)