A man has been arrested at Stansted Airport in Essex after security officials found him in possession of a handgun.
The man is thought to have been travelling to Spain
He was taken into custody on Friday morning, but Essex Police say he is not being questioned under the Terrorism Act.
The 44-year-old businessman from Norfolk was passing through a routine security check at 0500 GMT when he was found carrying the weapon, which fires ball bearings.
Essex Police say the firearm is similar to a airgun and is not able to discharge bullets.
It is believed the man is British and was preparing to travel to Spain alone.