ATHENS – At least 30 Greek police officers were involved in a racket selling citizenship papers to migrants, an Internal Affairs Division investigation reportedly found, with some 20 arrested so far.

Citizens Protection Ministry sources not named told Kathimerini that the scheme was broken after a months-long probe that discovered dozens of people involved.

Ten of those detained were active on the force, the paper said, the investigation one of the biggest undertaken by internal officers charged with rooting out corruption and wrongdoing on the force.

Most of those accused were connected to police stations in West Attica, the report said, adding that raids were conducted at precincts in other parts of the capital, according to the sources.

They indicated that the racket appears to have been led by a high-ranking officer at the West Attica Security Division and that a raid on his office found a safe holding 320,000 euros ($362,333) in cash.

The other suspects include a lawyer and two regional authority employees. It wasn’t said if more detentions or arrests were expected or if other precincts were involved. No names were given in accordance with Greek privacy laws.