FILE - In this April 15, 2013 file photo, medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion in Boston. A federal grand jury in Boston returned a 30-count indictment against bombing suspect Dzhokhar Tsarnaev on Thursday, June 27, 2013, on charges including using a weapon of mass destruction and bombing a place of public use, resulting in death. (AP Photo/Charles Krupa, File)

Associated Press
FILE - In this April 15, 2013 file photo, medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion in Boston. A federal grand jury in Boston returned a 30-count indictment against bombing suspect Dzhokhar Tsarnaev on Thursday, June 27, 2013, on charges including using a weapon of mass destruction and bombing a place of public use, resulting in death. (AP Photo/Charles Krupa, File)
FILE - In this April 15, 2013 file photo, medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion in Boston. A federal grand jury in Boston returned a 30-count indictment against bombing suspect Dzhokhar Tsarnaev on Thursday, June 27, 2013, on charges including using a weapon of mass destruction and bombing a place of public use, resulting in death. (AP Photo/Charles Krupa, File)
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