Two men and a woman have been arrested on suspicion of assisting the Russian intelligence service.
The Metropolitan Police said they were detained in Essex as part of a counter-terror investigation.
A 41-year-old man and a 35-year-old woman were arrested at an address in Grays, Essex.
A 46-year-old man was arrested at a separate address in the Grays area.
They were taken to a London police station and held under the National Security Act.
Officers searched the two Essex addresses and all three have now been released on bail with conditions.
Commander Dominic Murphy said: “Through our recent national security casework, we’re seeing an increasing number of who we would describe as ‘proxies’ being recruited by foreign intelligence services.”
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