The arrests were made simultaneously across five provinces following a months-long investigation led by officers from the Warsaw Metropolitan Police and the Nadwiślański Border Guard Unit under the supervision of the Warsaw District Prosecutor's Office, state news agency PAP reported.
The six suspects—five men and one woman, all Polish citizens aged 36 to 52—include a person accused of leading the criminal organization, authorities said.
According to investigators, the case is directly linked to the discovery by Dutch authorities in September last year of 50 kilograms of cocaine concealed inside specially modified forklift truck batteries.
Investigators said members of the group had clearly defined roles, including purchasing vehicles, overseeing their modification with hidden compartments, organizing transport, hiring trucks and drivers, concealing drugs inside the vehicles, and supervising shipments to destinations elsewhere in the EU.
The suspects have been charged with participation in an organized criminal group, including directing its activities, and with organizing the transport and cross-border smuggling of large quantities of narcotics to other EU countries.
A Warsaw court ordered five of the suspects to be held in pre-trial detention for three months at the request of prosecutors.
The sixth suspect was placed under police supervision.
Kierwiński said on X that the arrests marked the dismantling of another organized criminal group involved in drug smuggling and trafficking.
The operation was supported by the EU's Europol police agency, which provided analytical assistance and coordinated the exchange of information between the Polish Border Guard and Dutch law enforcement authorities, officials said.