Two of four men arrested on suspicion of spying for Iran have been released without charge.
The four were arrested on 6 March on suspicion of assisting a foreign intelligence service, relating to Iran.
The investigation relates to the surveillance of locations and individuals linked to the Jewish community in the London area.
A warrant for their further detention was granted on 12 March, allowing for them to be detained in police custody up until 20 March.
Police outside a property on Brookdene Avenue in Watford during searches. Pic: PA
On Sunday, one of the men was released from custody without charge.
Another man has also been released without charge, said police.
Two men, a 40-year-old and a 22-year-old, arrested in the Barnet and Harrow areas respectively, remain in custody.
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Deputy Assistant Commissioner Vicki Evans, senior national coordinator for Counter Terrorism Police, said: “This has been a long-running investigation, and part of our ongoing work to disrupt malign activity where we suspect it.
“We fully recognise that the public – and in particular the Jewish community – may be concerned, but I also hope the action we have taken reassures them that we will not hesitate to take action if we think there may be a threat to their safety.
“As ever, I would ask them to remain vigilant and if they see or hear anything that concerns them, then to contact us.”
