Four men have been arrested in London on suspicion of spying for Iran, the Metropolitan Police said.
They were detained by counter-terrorism detectives on suspicion of "aiding Iran’s intelligence service by spying on locations and individuals linked to the Jewish community", it said.
The one Iranian and three dual British-Iranian nationals were arrested shortly after 1am at addresses in Barnet, Watford and Harrow as part of a planned operation.
Six other men were arrested at the same address in Harrow on suspicion of assisting an offender. All 10 men were taken into custody.
Commander Helen Flanagan, head of Counter Terrorism Policing London, said the arrests “are part of a long-running investigation and part of our ongoing work to disrupt malign activity where we suspect it".
She added: “We understand the public may be concerned, in particular the Jewish community, and, as always, I would ask them to remain vigilant and if they see or hear anything that concerns them, then to contact us.”
The arrests and search activity is being led by Counter Terrorism Policing London.
The head of Britain's domestic spy service MI5 said in October that the intensity of Iranian activity against the UK had increased, with more than 20 potentially lethal plots launched last year.
In his annual address, the security agency’s director general Sir Ken McCallum said there had been the same number of plots over the 12 months to October 2025 as there had been from January 2022 to October 2024.
A number of Iranians have been charged this year in connection with plots in the UK, including three charged in September 2025 with spying for Tehran’s foreign intelligence service.
