A man has been stopped at the Brisbane Domestic Airport terminal after trying to transport a gun into the building.
Security staff found the gun in the man's luggage and called the Australian Federal Police who now have him in custody.
An airport insider told 9NEWS that the traveller had flown in from the U.S, however authorities haven't yet discovered when or where he arrived in Australia.
An AFP media officer would not comment, other than to confirm that a man had been arrested.
More to come.