HOUSTON (KTRK) -- A gun was accidentally fired at the ticket counter inside Bush Airport today.According to airport officials, a passenger at the Delta ticket counter in Terminal A had a gun in his carry-on baggage and was taking it out to check it in. That's when it reportedly fired inside the bag.The man was detained and questioned at the airport. He's facing a deadly conduct charge, which is a Class A misdemeanor.We're told there are no reports of injuries and no disruption of service.