It happened around 7:20 a.m. Monday in the rear yard portion of police headquarters on Sea Street, Capt. John Dougan said. No was hurt.
Dougan said an administrative investigation determined that Sgt. Brian Flaherty accidentally discharged the shotgun. Flaherty was not disciplined.
“He leaned back and hit the trigger by mistake,” Dougan said. “There was a round in the chamber and it shot through the window.”
The shotgun discharged as Flaherty returned to the station at the end of his overnight shift, Dougan said.
Several Quincy Police cruisers have shotguns, which are locked in place in a way that is designed to prevent anyone other than an officer from unhinging them.
At the end of each shift, firearms in cruisers are supposed to be locked and chambers cleared of shells, Dougan said. They are then supposed to be checked at the beginning of each shift, he said.
“The gun’s supposed to be unloaded,” Dougan said. “Whoever had it out last neglected to take the round out of the chamber.”
Dougan said the department will be retraining police personnel who have access to shotguns while on duty.