BBCFour people have been arrested in London as part of a counter-terrorism investigation relating to Iran, the Metropolitan Police have said.
Police arrested one Iranian and three dual British-Iranian nationals on suspicion of assisting a foreign intelligence service.
The investigation relates to the suspected surveillance of locations and individuals linked to Jewish communities in London, the Met said.
Searches remain ongoing in Watford, Barnet, and an address in Wembley.
A 40-year-old and a 55-year-old were arrested at addresses in Barnet, a 52-year-old in Watford and a 22-year-old in Harrow.
Six other men aged 29, 39, 42, 49 and two aged 20, were arrested at the same location in Harrow on suspicion of assisting an offender.
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