A judge in Papua New Guinea has called for a nationwide review of prisons after the discovery of unlawful confinement, or dark, cells in a Madang jail.
The cells were being used for discipline within the jail.
Justice David Cannings said four detainees were being held in cells with no light and no fresh air.
The National Court in Madang has ordered that the prisoners be moved to other cells.
Justice Cannings said that the four were spending 24 hours a day in the dark cells, and had been sent there for 3 months.
The National newspaper reports the judge described the treatment as cruel and inhumane.
Justice Cannings has called for the correctional services commissioner to review disciplinary systems in jails across the country.