A 27-year-old UK-Iranian man was arrested in London on suspicion of preparing terrorist acts following a security incident at a U.S.-run military air base. The man, identified as a dual citizen, was detained by counter-terrorism police in Westminster. A second man was questioned under caution as part of the investigation. The incident at RAF Fairford has been linked to Tehran by British authorities. Police have conducted searches as part of the probe. The arrest follows a security breach at the air base, which authorities believe may be connected to Iran. The suspect is currently in custody. The case is under review by counter-terrorism units. The incident has raised concerns about security at military installations. The investigation is ongoing.