A 25-year-old dual British-Iranian national arrested over suspicion of plotting a terrorist attack near a U.S.-run military base in England has been released on bail, authorities said Saturday.
The man was arrested Thursday in London on suspicion of preparing terrorist acts near RAF Fairford, an air base used by U.S. bombers to conduct strikes against Iran.
He is the sixth person arrested and subsequently released on bail as British detectives investigate the security incident, authorities said.
British officials have linked the incident to Tehran, although they have not disclosed details of what the suspects allegedly planned or why Iran is believed to have been involved.
The five other suspects, all British men in their 20s from London, have also been released on bail. Their identities have not been made public.
The incident began early Sunday when scores of residents living near the base were evacuated as armed police and army bomb-disposal experts searched the surrounding rural area.
Police later said they found gasoline in three vans linked to the five suspects, but no explosives were discovered.
Prime Minister Andy Burnham said Britain had “strong indications” that Iran was involved in the incident but did not provide further details.
Iran has denied any involvement. Tehran has previously said that military bases used to launch attacks against Iran would be considered legitimate targets.
Located about 160 kilometres west of London, RAF Fairford has been used by U.S. bombers in conflicts across the Middle East for decades, including this year's war with Iran.
The arrests came amid heightened concerns in Britain over activities by hostile states. British security officials have said both Russia and Iran have used proxies to carry out criminal activities in the country.
Officials said national security cases involving hostile-state activity, including Iran, rose by 50 percent in the six months to December 2025.
British authorities have also accused proxies linked to Iran of carrying out arson attacks and other incidents in Britain and elsewhere, with several targeting Jewish communities and allegedly aimed at creating fear.
They have previously warned that Tehran could broaden its targets in Britain if conflicts in the Middle East persist.