A Hopkinton, New Hampshire, man has been indicted by a federal grand jury on a charge of illegally possessing guns and ammunition as a convicted felon, the U.S. attorney's office for New Hampshire said Thursday.

Joshua Gragg, 39, is accused of keeping several guns in his bedroom, including at least three so-called ghost guns, which prosecutors said were made with a 3D printer.

According to prosecutors, investigators searched Gragg's home in September and also found almost 3,000 rounds of ammunition, 20 gun suppressors and 46 pistol frames. The frames were also made with a 3D printer, the office said.

Homeland Security Investigations led the case, with help from the federal Bureau of Alcohol, Tobacco, Firearms and Explosives.

The charge carries a maximum sentence of 15 years in prison.

The charges are allegations, and Gragg is presumed innocent unless and until proven guilty in court.

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