Three State troopers were suspended without pay Thursday amid an internal investigation into the transfer of surplus weapons, State Police said.

The suspended troopers had been assigned to the department’s armory at the State Police academy in New Braintree, State Police spokesman David Procopio said in a statement. Procopio said the investigation concerns a “limited number” of weapons that went to a state-authorized vendor.

State Police did not identify the troopers, and they did not say what aspects of the weapons transfer sparked the investigation. Procopio said the department would have no further comment.