The companies were run by Poles, Vietnamese, Chinese and Ukrainians and paid either no tax or only partial tax, transferring the money saved overseas.
On Wednesday morning, 300 officers detained 18 people suspected of participating in the organised crime group. According to investigators, the 26 companies involved operated chiefly in Wolka Kosowska, outside Warsaw.
"According to the investigation's findings, the group transferred at least PLN 8.6 billion out of the country through a national payment institution," the CBA's communications office told PAP. "Those funds are believed to have come from unpaid due taxes or their partial payment."
CBA officers, with the support of the Border Guard and Military Police, raided 60 apartments and company headquarters on Wednesday morning. They conducted searches and secured company documentation and IT equipment.
CBA agents detained 18 suspects, among them the president of a national payment institution and five members of a company's management. The remaining suspects were people alleged to have transferred the funds. They are believed to have been active between 2016 and 2019.
Wednesday's operation was the result of several months' investigation conducted by the CBA under the supervision of the Warsaw Regional Prosecutor. The CBA said it does not rule out further detentions. (PAP)