A UK-Iranian dual national arrested in connection with a security incident at RAF Fairford has been released on bail. The 25-year-old was detained in Westminster on Thursday on suspicion of preparing for acts of terrorism.

Searches of two properties in the same London borough have concluded as part of the ongoing investigation. The arrest follows a major security alert last weekend at the Gloucestershire airbase, which saw dozens of homes evacuated after police were alerted to three suspicious vehicles.

Five other men, all UK nationals from London and in their twenties, were arrested in connection with the same incident. They were initially detained on suspicion of explosives offences before the focus shifted to suspicion of preparing a terrorist act. All five were subsequently released on police bail on Monday.

Prime Minister Andy Burnham chaired a Cobra meeting following the incident. He stated there were strong indications of Iranian involvement, though Tehran has vehemently denied any participation, calling such links "unfounded and malicious speculations."

The incident at RAF Fairford, a base used by the US Air Force, occurred after vehicles were reported moving towards the site in the early hours of the morning. A farmer alerted police after seeing a group of masked men near the vehicles. Investigations are continuing into the precise circumstances surrounding the events.

In recent months, RAF Fairford has been used by US bombers for operations in the Middle East, following UK approval for its use in defensive strikes against Iran. In July, Iran had warned that any base used for aggression against its territory would be considered a legitimate target.

US Secretary of State Marco Rubio commented on the situation, suggesting a "foreign actor" was involved, though he provided no specific evidence. US President Donald Trump expressed surprise at the release of the five arrested men on bail, stating his administration would not have released them.

The police described the decision to release the men on bail as an "investigative decision that was grounded in experience and strategy." The investigation aims to fully understand the events that led to the security alert and the arrests.