A member of the US army has been arrested by British counter-terrorism police.
The man, 41, was arrested as part of an investigation by Counter Terrorism Policing, working closely with US authorities, the US military and the FBI, Counter Terrorism Policing London said.
He has been arrested on suspicion of offences under section 1 and section 3 of the National Security Act 2023 near Gloucester, Gloucestershire, on Tuesday.
The man remains in custody at a London police station.
Officers are carrying out searches at two locations in Gloucestershire.
Police said the country to which the allegations related was Russia.
