The FBI is now offering a $5,000 reward for information leading to the recovery of a sub-machine gun stolen from an agent’s car in Central Costa County last month, a spokesman said Thursday in a statement.

The weapon, an H&L 10mm MP-5, was stolen sometime between 6 p.m. Jan. 8 and 10 a.m. Jan. 9, as the agent made stops in Concord, Lafayette, and Orinda. Both the FBI and the Contra Costa County Sheriff’s Department, which is assisting in the investigation, have refused to say where the car was parked in any of the three cities or describe the vehicle.

A bulletproof vest and an ammunition clip were also stolen. The public is asked to call 415-553-7400 with any information about the stolen items.

The Bay Area News Group reported last year on 944 police guns that between 2010 and 2016 were either stolen from police or could not be accounted for by law enforcement agencies in the Bay Area and state and federal agencies in California. Many of the stolen guns had been left in backpacks or duffel bags in officer’s personal vehicles.

Gov. Jerry Brown signed a bill in September, sponsored by Sen. Jerry Hill, D-San Mateo, requiring police to lock away weapons left in unattended cars and trucks. A spokesman for the sheriff’s office wrote in a statement last month that the FBI sub-machine gun was “lawfully stored” in the agent’s car but wouldn’t say how.

As the FBI searches for its own weapon, it recovered a handgun in Oakland last week that a San Francisco Deputy Sheriff claimed was stolen from her home last year. But she now faces federal fraud charges for filing an insurance claim for $64,000 worth of items, including the gun, which she allegedly said was hers when it really belonged to the department.

The FBI alleges in court documents that the deputy had an “intimate relationship” with an inmate while she was a jail guard, and that man now faces federal charges of being a convicted felon in possession of the firearm.