A United Nations report says prisoners held at a number of facilities in Afghanistan have been tortured.
It says detainees in 47 facilities in 24 provinces run by the Afghan Directorate of Security and National Police were abused.
The BBC reports NATO has stopped transferring detainees to some facilities as a result of the report's findings.
The report says prisoners were mostly subjected to interrogation techniques that constituted torture under international and Afghan law.
Based on interviews with 379 prisoners, the report said that many inmates appeared to display visible signs of injuries and marks which suggested that they had been badly beaten or abused.
There has been no reaction from the Afghan authorities so far, but the BBC reports the government last month rejected the accusations.