British police said Thursday that a 22-year-old British man suspected of preparing terrorist acts against an airbase has been released on bail. He is the seventh person arrested as part of an investigation into an alleged plot targeting RAF Fairford.

Counter Terrorism Policing said the man was arrested in Westminster, where officers also searched a property. The investigation centers on suspected terrorist activity connected to the Gloucestershire airbase.

The United States said Monday that an Iran-linked threat led to the withdrawal of American bomber aircraft from RAF Fairford. The US has previously used the British base in military operations against Iran.

Six other men arrested in connection with the investigation have also been released on bail by British authorities.

US officials told Reuters that the bombers were redeployed because of concerns over a suspected Iranian plan to conduct a sophisticated drone attack against the facility. Many details surrounding the alleged plot, however, have not been publicly disclosed.

British-Iranian National Among Those Arrested

Five of the suspects were arrested near RAF Fairford on September 27. All five were British nationals. A dual British-Iranian citizen was arrested later that week and subsequently released on bail.

Counter-terrorism police said the latest suspect was released under strict conditions while the investigation continues.

The arrests followed a major police response at RAF Fairford, a facility that hosts US Air Force personnel and has played an important role in American military operations.

Authorities have not publicly provided detailed evidence describing the alleged plot or explained precisely what actions the suspects are accused of taking. The investigation remains active.