Tehran denies involvement in UK Fairford air base incident as Britain summons Iranian ambassador

British Prime Minister Andy Burnham said on Monday that a suspected plot targeting the RAF Fairford air base in Britain was "highly likely" to have been coordinated in Iran – and almost certainly directed by the Islamic Revolutionary Guard Corps.

The RAF Fairford base in southwest England had been used by US bombers to carry ‌out strikes on Iran and became the focal point for a major security response after five British men were arrested nearby ⁠in the early hours of September 27 on suspected terrorism and explosive offences.

US officials told Reuters of a suspected plot involving Iran to launch a drone attack, and last week US President ‌Donald Trump said an Iran-linked threat had prompted a decision to withdraw the bombers from the base.

US bombers leave UK air base amid 'new threats'

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"I can ⁠confirm our assessment that it is highly likely to have been coordinated in Iran, almost certainly directed by Iran's Islamic Revolutionary Guard," Burnham told parliament. Iran has rejected any connection to the Fairford incident.

"Tehran has had no involvement in this matter, and if the British ​government possesses any documents or evidence to support its claims, it should present them," said Iran's Ambassador to Britain, Seyed ‌Ali Mousavi, according to Iranian state news agency, IRNA.

British foreign minister Ed Miliband said he had summoned the Iranian ambassador.

Fairford plot details remain patchy

Details around the suspected plot remain thin. The five detained men were later released without charge on police bail "under stringent conditions", and two other men who were arrested – including a British-Iranian national – were also subsequently released.

Detectives said petrol but no viable explosive had been found in ‌the vans seized along with the five men. However both police and Burnham have pointed to the involvement of a foreign state.

Read moreUK police arrest dual UK-Iranian national over Fairford air base incident

British Home Secretary Shabana Mahmood told parliament that a known individual based in Iran – whom she did not name – was believed to be behind what had happened.

"We will not tolerate these threats on our soil," Burnham said. "We will crack down on Iran's use of criminal networks, using our full range of powers to target them and their funding streams, and we will bring further sanctions ​to restrict the capacity of Iran and the IRGC to do us harm."

Foreign ministries from almost 30 countries including the US, Canada, France and Germany ​issued a statement condemning "Iran’s use of violent attacks, including the acts of lethal plotting, arson, sabotage, cyber-attacks, ​and other hybrid activities against us and our partners".

"The UK has also concluded this event demonstrates the IRGC’s continued willingness to project hostile activity beyond its borders through covert networks and proxy actors," the statement said.

British authorities ​have for a number of years accused Iran of being involved in numerous plots and attempted assassinations in the UK using criminal networks and proxies – accusations that Tehran has repeatedly denied.

Read moreUK police arrest 22-year-old British man in suspected Fairford base plot

Last year Britain said there had been 20 credible Iranian-backed threats to kill or kidnap individuals based in the UK.

In July, Britain used new powers to ban support for the IRGC and linked group, Harakat Ashab al-Yamin al-Islamiya (HAYI), which claimed responsibility for seven attacks earlier this year at locations linked to Jewish ⁠and Israeli communities, and Persian-language media.

The British Foreign Office announced two Iranian nationals had been sanctioned. They are Ruhollah Bazghandi – ⁠who Britain said was the IRGC's ​head of counterespionage operations; and Shahram Ali Reza Tamarzadeh Jakki – a facilitator for the already-sanctioned Zindashti criminal network, which is accused of involvement in several plots against Iranian dissidents.