They were later arrested on suspicion of preparation of a terrorist act, according to a statement by Counter Terrorism Policing, who are now leading the investigation.

Local police are now working with Counter-Terrorism Policing to determine the full nature of the situation. A major incident was declared at the scene earlier today.

A 400m cordon has been put in place while the British Army’s explosives team examines the vehicles at the scene.

Assistant Chief Constable Richard Ocone from Gloucestershire Police told reporters at a press conference: “As a precaution, around 85 households have been advised to evacuate while these examinations take place.”

RAF Fairford hosts the United States Air Force, and is being used by U.S. forces to carry out strikes against Iran.

A U.K. government spokesperson said: “The Prime Minister is being kept updated on the incident in Gloucestershire. We are grateful to the emergency services, who have acted quickly to detain several suspects and put measures in place to keep the community safe. It would be inappropriate to comment further whilst investigations are ongoing.”