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Associated Press
This combination made with Nov. 21, 2013 Massachusetts Bay Transit Police booking photos released Wednesday, July 23, 2014 by the Dorchester District Court in Boston shows Stephen Sergio Silva, after he was arrested and charged with selling marijuana at a Boston train station. Silva was arrested Monday, July 21, 2014 on federal charges of heroin trafficking and possession of a handgun with an obliterated serial number. The same gun was used to kill MIT police Officer Sean Collier during a manhunt for the Boston Marathon bombing suspects, according to two people with knowledge of the case who spoke to The Associated Press on the condition of anonymity. (AP Photo/Massachusetts Bay Transit Police)

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