A Centreville man who packed a loaded .38-caliber revolver in his carry-on bag as he attempted to board a jetliner at Dulles International Airport on Sunday was stopped at a security checkpoint and faces a state weapons charge, authorities said.

Joseph Farah, 49, was cited by airport police on a weapons charge after a checkpoint X-ray machine alerted Transportation Security Administration officers to the gun in his bag, the TSA said. It is the third gun that TSA officers have detected at one of the airport checkpoints this year.

Weapons are not allowed in carry-on bags, but are permitted in checked bags if they are unloaded and declared to the airline. Passengers caught with firearms at checkpoints may face criminal charges from law enforcement and civil penalties from TSA of up to $11,000.

Passengers are responsible for what’s in the bags they bring to the security checkpoint, the TSA said.