Boston Marathon

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Police in tactical gear surround an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. The bombs that blew up seconds apart near the finish line of the Boston Marathon left the streets spattered with blood and glass, and gaping questions of who chose to attack and why. (AP Photo/Charles Krupa) Police in tactical gear surround an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19,

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Sticking together: A group of first responders to the Boston Marathon bombings comfort one another during a tribute during a baseball doubleheader between the Boston Red Sox and the Kansas City Royals on Sunday.

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Boston police Commissioner Ed Davis (at podium), accompanied by Massachusetts State Police Col. Timothy Alben (second from right) and Gov. Deval Patrick (right), speaks during a news conference after the arrest of 19-year-old Dzhokhar Tsarnaev, a suspect of the Boston Marathon bombings, in Watertown, Mass., on Friday, April 19, 2013. (AP Photo/Matt Rourke)

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Law enforcement search for the suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Gunfire erupted Friday night amid the manhunt for the surviving suspect in the Boston Marathon bombing, and police in armored vehicles and tactical gear rushed into the Watertown neighborhood in a break in the case. (AP Photo/Matt Rourke)

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Boston Marathon terror suspects Tamerlan and Dzhokher Tsarnaev. (McClatchy)

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** FILE ** A neighbor is escorted to safety as police surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013. (AP Photo/Charles Krupa)

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A Boston Bruins jersey with the number of Boston's area code and the words "Boston Strong" hangs in the locker of Bruins player Jay Pandolfo at TD Garden in Boston, Wednesday, April 17, 2013, after an NHL hockey game against the Buffalo Sabres in the aftermath of Monday's Boston Marathon bombings. (AP Photo/Jimmy Golen)

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Ruslan Tsarni, the uncle of the Boston Marathon bombing suspects, speaks with the media outside his home in Montgomery Village, Md., on April, 19, 2013. (Associated Press)