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Dutch police arrest Syrian man suspected of being IS member and of planning attack

Dutch police have arrested a 29-year-old Syrian man they suspect of being a member of the Islamic State and planning an attack somewhere in Europe, prosecutors said on Tuesday, based on the man’s social media posts.

The prosecutors said the intelligence agency AIVD had found social media posts in which the man threatened to commit an attack at an unspecified place in Europe around Christmas.

They did not elaborate on the suspected planned attack or on their suspicions that the man was a member of the Islamic State.

The man was arrested on December 18 in his house in Vlissingen in the southwest of the Netherlands, and a court on Tuesday ruled that his detention would be extended by at least 30 days as an investigation continued.

Incident Details

Type of Incident: Arrest
Date of Incident: December 30, 2025
City: Vlissingen
Country: The Netherlands

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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.