The group, led by federation chairman Boonyarit Nipawanit, claimed that the use of normal law would cause delays and might risk interference by local influential figures because the case involved many state officials.

They said that if the case was tackled seriously it could lead to the end of the unofficial tradition of sex services being offered to senior officials.

Meanwhile, lawyer Kerdpol Kaewkerd, who represented the victims of the prostitution ring, said the government should expedite legal actions in the case as there have been attempts to interfere with the work of investigators.

He said that if the investigation was prolonged the victims might lose interest in fighting the case as they would feel that they did not get justice.