Boston Marathon

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Boston Marathon bombing hero Carlos Arredondo waves to the crowd as he walks onto the field at Fenway Park during ceremonies marking the one-year anniversary of the bombing before a baseball game between the Boston Red Sox and the Baltimore Orioles in Boston, Sunday, April 20, 2014. (AP Photo/Michael Dwyer)

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Boston Marathon bombing survivors gather on the field at Fenway Park during ceremonies marking the one-year anniversary of the bombing before a baseball game between the Boston Red Sox and the Baltimore Orioles in Boston, Sunday, April 20, 2014. (AP Photo/Michael Dwyer)

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Boston Marathon bombing survivors including Jeff Bauman, right, and Carlos Arredondo, walk onto the field at Fenway Park during ceremonies marking the one-year anniversary of the bombing before a baseball game between the Boston Red Sox and the Baltimore Orioles in Boston, Sunday, April 20, 2014. (AP Photo/Michael Dwyer)

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Family members of Boston Marathon bombing victim Lu Lingzi walk off the field after announcing "play ball" during ceremonies marking the one-year anniversary of the bombings before a baseball game between the Boston Red Sox and the Baltimore Orioles in Boston, Sunday, April 20, 2014. (AP Photo/Michael Dwyer)

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Family members of Boston Marathon bombing victim Lu Lingzi walk off the field after announcing "play ball" during ceremonies marking the one-year anniversary of the bombings before a baseball game between the Boston Red Sox and the Baltimore Orioles in Boston, Sunday, April 20, 2014. (AP Photo/Michael Dwyer)

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In this March 14, 2014 photo, Boston marathon qualifier Mike Johnson is photographed in Minneapolis, Minn. Johnson plans to wear the same orange shoes in this year's Boston Marathon that he wore last year. More than 600 Minnesota runners will line up for the start of the Boston Marathon this year, including 212 who ran last year and say they're going back to finish what they started. (AP Photo/The Star Tribune, Flores, Elizabeth)

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Boston Marathon bombings survivor Rebekah Gregory DiMartino wipes teas as she is led in her wheelchair after crossing the finish line of the Boston Marathon Tribute Run with Tracy Kiss, left, of Framingham, Mass., in Boston, Saturday, April 19, 2014. (AP Photo/Elise Amendola)

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Boston Marathon bombing survivors, family and friends gather in circle after crossing the finish line of the marathon during a Tribute Run, Saturday, April 19, 2014, in Boston. The 118th Boston Marathon is scheduled to run on Patriots Day, Monday, April 21. (AP Photo/Charles Krupa)