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Counter-terrorism police also questioned a UK national, days after five others were arrested and released on bail.

A man with dual UK-Iranian citizenship has been arrested in connection with an alleged security incident at an airbase in southwest England over the weekend.

British counter-terrorism police said on Thursday that a “27-year-old man, a dual UK/Iranian national, was arrested” in central London.

He was detained “on suspicion of preparation of terrorist acts” as part of an investigation into the events Sunday near RAF Fairford.

A second man, 26 – a UK national – was also “questioned under caution”, the police statement added.

The RAF base 160km west of London has been used by US bombers during decades of conflicts in the Middle East, including the US and Israel’s war on Iran, which began in February.

On Sunday, five men, all in their 20s and from London, were arrested on suspicion of explosives offences and “terrorism” over the incident at RAF Fairford. They have since been released on bail.

“The investigation into circumstances surrounding events in Gloucestershire is hugely complex, and our specialist teams are interrogating multiple lines of enquiry,” Vicki Evans, the senior national coordinator for counter-terrorism policing for the Metropolitan Police, said in a statement.

“As we’ve made clear, we’re looking at all possible angles – including possible foreign state involvement.”

Earlier, UK Prime Minister Andy Burnham said there were “strong indications” that Iran played a role in an alleged security incident.

Iran, however, strongly denied any involvement in the incident and the country’s foreign minister, Abbas Araghchi, hit back at Burnham’s allegations.

More to come…