WORCESTER, Mass. — A Worcester man has been arrested and charged with trafficking in firearms after a monthslong investigation into illegal gun trafficking in the city, the Worcester Police Department said Friday.

The department's SWAT team made the arrest, police said. The department did not release the man's name or age, or say when the arrest took place.

Investigators seized more than 38 guns and 3D-printed ghost gun frames, according to police. They also seized a 3D printer that police said was used to make and traffic the weapons, two silencers, six high-capacity ammunition feeding devices and ammunition.

Ghost guns are firearms assembled from parts or made at home, often without serial numbers, which makes them difficult to trace.

The investigation was led by the department's gun intelligence unit, working with the federal Bureau of Alcohol, Tobacco, Firearms and Explosives, the U.S. Postal Inspection Service, and the gang units of the Worcester police and the Massachusetts State Police, the department said.

Police did not say whether the man has been arraigned or whether he has a lawyer.

The charge is an allegation, and the man is presumed innocent unless and until proven guilty in court.

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