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New arrest linked to gun used after Boston attacks

BOSTON (AP) — A friend of Boston Marathon bombing suspect Dzhokhar Tsarnaev is believed to have provided the handgun used to kill a Massachusetts Institute of Technology police officer during the manhunt, people with knowledge of the investigation said Tuesday. Stephen Silva made an initial appearance in federal court on charges related to heroin trafficking and possession of a handgun with an obliterated serial number. An attorney for Silva, Jonathan Shapiro, said Tuesday evening that he had received the case only a few hours earlier and was not in a position to comment. The 9 mm Ruger pistol described in the indictment is the same handgun that was used to kill MIT police officer Sean Collier during the manhunt for the bombing suspects, according to the two people, who spoke on condition of anonymity because they were not authorized to discuss the investigation. The grand jury indictment, which was filed July 15, does not mention Collier's slaying or any connection to Tsarnaev. The origin of the gun was among the lingering mysteries of the investigation into the April 2013 attack, in which three people were killed and more than 260 were injured when twin bombs exploded near the finish line. Collier, 26-year-old MIT campus police officer, was ambushed several days later and shot multiple times in his car. According to the indictment, Silva knowingly had possession of the gun, "which had the importer's and manufacturer's serial number removed, obliterated, and altered and had previously been shipped and transported in interstate and foreign commerce." The indictment also alleges that Silva conspired to distribute heroin this summer in the Boston area. Silva is a friend of Dzhokhar Tsarnaev. He said in court Tuesday that he graduated from Cambridge Rindge and Latin School in 2011, the same year as Tsarnaev. Silva was ordered to remain in custody ahead of a bail hearing scheduled for Aug. 6. Dzhokhar's brother, Tamerlan Tsarnaev, was killed in a shootout with police several days after the bombings. Dzhokhar Tsarnaev escaped but was soon found, wounded and hiding in a boat dry-docked in a backyard in suburban Watertown. Dzhokhar Tsarnaev has pleaded not guilty and is scheduled for trial in November. He faces the possibility of the death penalty if convicted. Four other men have been charged with crimes related to the bombing investigation. On Monday, a federal grand jury found Azamat Tazhayakov guilty of obstruction of justice and conspiracy for trying to protect Tsarnaev by agreeing with another friend, Dias Kadyrbayev, to get rid of a backpack and disable fireworks they took from his dorm room. Kadyrbayev is to be tried next month on the same charges. Robel Phillipos, who is charged with lying to investigators about being in the dorm room with Kadyrbayev and Tazhayakov the night the items were taken, is to have a separate trial in September. And a friend of Tamerlan Tsarnaev, Khairulluzon Matanov, is to be tried next year on charges that he lied to investigators about the extent of his friendship with Tamerlan Tsarnaev and the contact he had with both brothers in the days following the bombings.

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