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Photo by: Matt Rourke

Boston police Commissioner Ed Davis (at podium), accompanied by Massachusetts State PoliceCol. 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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