Police are preparing to summon at least 20 more suspects in connection with the child-prostitution ring in Mae Hong Son province, a source said on Sunday.
It added that five summonses would be issued very soon, most of them for policemen.
At present, at least nine policemen have already been dismissed from the service for their alleged roles in the scandal.
The results of the ongoing investigation will determine whether they can rejoin the police force. There are also seven civilians being detained over the scandal.
The same source said an elderly man seen in a picture next to a girl with an owl tattoo on her breasts worked for a cement-delivery firm in Mae Hong Son and, contrary to initial speculation, he was not a senior government official.