The following authorities took part in the investigation:

• Albania: Special Prosecution Office for Anti-Corruption and Organised Crime (Struktura e Posaçme Anti-Korrupsion), National Bureau of Investigation (Byroja Kombëtare e Hetimit), Albanian State Police (Policia e Shtetit)
• Belgium: Federal Police (Federale Politie)
• France: National Police (Police Nationale)
• The Netherlands: National Police (Politie)