A leading French Polynesian union leader, Cyril Legayic, has been transferred to Tahiti's Nuutania prison amid an investigation into alleged corruption
Mr Legayic, who is the secretary general of the confederation of independent unions, was first detained with Gaston Tetuanui who was a candidate in this year's French parliamentary election.
The arrests come amid charges that the union leader engaged in corrupt practices by accepting money from employers to maintain the social peace.
The jailing is seen as a move to prevent the suspects from contacting other people.
Local media reports say unnamed significant people are also being probed.
This comes as Mr Legayic is due back in court in Papeete in the appeal court case over the so-called phantom jobs.
He was given a three-month suspended jail sentence for his role in accepting funds from the former president, Gaston Flosse, while also being on the union payroll.