FILE - This combination of file photos shows brothers Tamerlan, left, and Dzhokhar Tsarnaev, suspects in the Boston Marathon bombings on April 15, 2013. Tamerlan Tsarnaev died after a gunfight with police several days later, and Dzhokhar Tsarnaev, was captured and is held in a federal prison on charges of using a weapon of mass destruction. A year after the bombings, prosecutors said they have a trove of evidence to use against Dzhokhar Tsarnaev, including surveillance video showing him placing one of the bombs just yards from Martin Richard, the 8-year-old boy who died in the blast. (AP Photos/Lowell Sun and FBI, File)
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