Europol celebrates the International Day of Police Cooperation

On 7 September, Europol is marking the International Day of Police Cooperation together with its partners to recognise the central role our network plays in tackling the most serious threats against the EU’s internal security.
Connecting investigators, expertise, and information across national boundaries is at the heart of Europol. When those connections are strong, law enforcement is better equipped to respond to the threats that cross borders.
The International Day of Police Cooperation recognises the vital role this cooperation plays in preventing and combating crime.
To facilitate law enforcement cooperation, Europol brings together at its headquarters over 300 Liaison Officers representing more than 50 countries. Europol’s Secure Information Exchange Network Application (SIENA) connects more than 3 800 national competent authorities, with more than 25 000 end users connected to the system.
From one country to the next, across Europe and beyond, there are investigators contributing to this cooperation, and ultimately, to the security of their communities. Despite working across different environments, wearing different uniforms, and speaking different languages, they are part of a wider network that depends on cooperation.
Sharing information, building connections and working with colleagues across borders all contribute to one mission: making communities safer.
One mission. One security.
#OneSecurity
Keeping Europe safe is not the job of one actor. It takes many people working together. From joint operations to everyday cooperation, security is built through coordination, trust, and shared responsibility. That is #OneSecurity: law enforcement working side by side with partners across borders, sectors, and communities.
With contributions from Albania, Armenia, Australia, Austria, Belgium, Bosnia and Herzegovina, Brazil, Colombia, Croatia, Cyprus, Czechia, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Israel, Italy, Kosovo*, Latvia, Lithuania, Luxembourg, Malta, Moldova, Montenegro, North Macedonia, Norway, Poland, Serbia, Slovakia, Slovenia, Spain, Sweden, and Switzerland.
* This designation is without prejudice to positions on status, and is in line with UNSCR 1244/99 and the ICJ opinion on the Kosovo declaration of independence.

Facts Only

* Europol marks the International Day of Police Cooperation on September 7th.
* The network connects investigators, expertise, and information across national boundaries to tackle threats against EU internal security.
* Europol brings together over 300 Liaison Officers representing more than 50 countries.
* Europol's SIENA connects over 3,800 national competent authorities.
* SIENA has more than 25,000 end users connected to the system.
* Cooperation involves investigators from various nations sharing information.
* Contributing nations include Albania, Armenia, Australia, Austria, Belgium, Bosnia and Herzegovina, Brazil, Colombia, Croatia, Cyprus, Czechia, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Israel, Italy, Kosovo*, Latvia, Lithuania, Luxembourg, Malta, Moldova, Montenegro, North Macedonia, Norway, Poland, Serbia, Slovakia, Slovenia, Spain, Sweden, and Switzerland.
* Kosovo's designation is without prejudice to status and aligns with UNSCR 1244/99 and the ICJ opinion.

Executive Summary

Europol marks the International Day of Police Cooperation on September 7th to recognize the network's role in addressing threats to EU internal security by connecting investigators, expertise, and information across national borders. This cooperation is central to law enforcement effectiveness, enabling a coordinated response to cross-border threats. Europol facilitates this through the presence of over 300 Liaison Officers from more than 50 countries at its headquarters. The Secure Information Exchange Network Application (SIENA) connects over 3,800 national competent authorities and more than 25,000 end-users. The cooperation involves investigators from numerous nations sharing information to enhance community safety through shared efforts across different environments, uniforms, and languages.

Full Take

The narrative emphasizes a functional reality where transnational security relies entirely on structured cooperation, framing this interdependence as the primary mechanism for achieving collective safety. The pattern observed is the construction of legitimacy through the sheer scale and complexity of the network—highlighting the 'many people working together' approach as the only viable response to borderless threats. This functions as a form of systemic reassurance by demonstrating that security is not an isolated national concern but a distributed responsibility. However, this emphasis on connectivity implicitly establishes an unstated dependency: the efficacy of European security is directly proportional to the operational capacity of this interconnected system. The underlying assumption is that shared information flow and trust are sufficient for collective action, which moves beyond mere logistical cooperation into a shared normative space regarding threat assessment and response protocols across diverse legal and cultural frameworks. The implication here is that sovereignty, in the context of internal security, is actively negotiated and supplemented by supranational operational necessities. What remains to be explored is how this reliance shapes the balance between national autonomy and collective enforcement when inherent differences in legal systems and jurisdictional priorities inevitably arise during high-stakes operations.