Poland’s national prosecutor is reopening a probe into alleged corruption involving government officials approving illegal slot machines.

Between 2006 and 2009, seven officials at the Ministry of Finance allegedly registered 78k slots as low-stakes/payout amusement with prizes (AWP) machines rather than high-stakes/payout slots, which were restricted under the country’s 1992 gambling law.

The Regional Prosecutor’s Office in Poznan investigated these allegations but ultimately determined that the officials were in the clear and closed the investigation on March 31.

However, Bogdan Swieczkowski, Deputy Prosecutor General at the National Prosecutor’s Office, has since ordered the investigation reopened to determine whether the regional prosecutor’s decision was justified.