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Four people arrested under National Security Act

Four people have been arrested as part of a Counter Terrorism Policing investigation into suspected National Security Act offences.

The men [A-D] were arrested on Friday, 6 March on suspicion of assisting a foreign intelligence service, contrary to section 3 of the National Security Act, 2023. The country to which the investigation relates is Iran.

Detectives from CTP London, which is leading the investigation, arrested the men, one Iranian and three dual British/Iranian nationals, shortly after 01.00hrs at addresses in Barnet and Watford, as part of a pre-planned operation.

The investigation relates to suspected surveillance of locations and individuals linked to the Jewish community in the London area.

Commander Helen Flanagan, Head of Counter Terrorism Policing London, said: “Today’s arrests are part of a long-running investigation and part of our ongoing work to disrupt malign activity where we suspect it.

“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 four men arrested under the National Security Act were:

[A] a 40-year-old man and [B] a 55 year-old man who were arrested at addresses in the Barnet area. Searches are ongoing at these locations and another address in Barnet.

[C] a 52-year-old man who was arrested at an address in Watford. Searches are ongoing at this location and at an address in Wembley.

[D] a 22-year-old man who was arrested at an address in Harrow.

Six other men [E-J], aged 29, 39, 42, 49 and two aged 20, were arrested at the same location in Harrow on suspicion of assisting an offender. One of the men was further arrested on suspicion of assaulting a police officer.

All 10 men have been taken into custody.

The arrests and search activity is being led by Counter Terrorism Policing London.

Incident Details

Type of Incident: Arrest
Date of Incident: March 6, 2026
City: London
Country: UK

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About Sentinel

SENTINEL is a European project funded by the European Commission and led by the Security and Crisis Centre (SACC by EJC), the security arm of the European Jewish Congress. It brings together the International Centre for Counter-Terrorism (ICCT), national-level Jewish communities from Austria, Czech Republic, Hungary, Italy, and Spain, the European Union of Jewish Students, with the support of the Italian Carabinieri and the Police Presidium of the Czech Republic.

The project is designed to strengthen the protection of Jewish places of worship across the European Union through a coordinated set of activities over a three-year period.

SENTINEL will harness AI-enhanced open-source intelligence to monitor and assess current, emerging, and future threats. It will also equip Jewish communities with practical tools, including a mobile security application with a panic button and an interactive map built on real-time incident data.

Training and capacity-building are at the core of the project. These include scenario-based security exercises, crisis management seminars, and both in-person and online training sessions for community security trustees. SENTINEL will also organise EU-wide and local conferences to foster collaboration between Jewish communities, public authorities, and law enforcement agencies.

Complementing these efforts, national and local workshops will promote knowledge-sharing and preparedness, alongside pilot training programmes for law enforcement. A dedicated podcast series will help raise awareness by exploring threat assessments and potential responses.

With its wide-reaching and inclusive approach, SENTINEL will directly benefit to Jewish communities across 23 EU Member States, enhancing resilience, strengthening preparedness, and building long-term cooperation with law enforcement to meet today’s evolving security challenges.