So far, 56 people have been charged and 16 placed under arrest in the probe led by prosecutors in the central city of Łódź and the Central Bureau for Combating Cybercrime (CBZC) in the western city of Poznań, Polish state news agency PAP reported.
Officials said the scheme defrauded about 2,000 victims of a total PLN 3.5 million (EUR 830,000).
The latest suspects, aged 27 to 30, are accused of participating in an organised criminal group, committing online fraud and laundering money, according to prosecutors.
The investigation covers crimes committed between March 2024 and June 2025 in Łódź, Wrocław, Wałbrzych and several other Polish cities.
Investigators said the gang posted online ads offering items ranging from furniture and tyres to household appliances.
Potential buyers were then redirected to what appeared to be reputable online marketplaces "for safety reasons," but the links led to fake websites.
The only payment option was the Blik instant payment system.
The suspects intercepted Blik transaction codes and withdrew cash from ATMs before transferring the money to cryptocurrency wallets to disguise its origin, prosecutors said.
Officers have seized computer equipment and storage devices, which are undergoing forensic analysis.
If convicted of fraud committed as part of an organised criminal group and of money laundering, the suspects face up to 15 years in prison, the PAP news agency reported.
(pm/gs)
Source: PAP