KABUL, Afghanistan — NATO has temporarily stopped transferring detainees to a number of Afghan jails after accusations of torture and abuse were uncovered in a report to be published soon, NATO and United Nations officials said Tuesday.

The findings in the report, by the United Nations Assistance Mission Afghanistan, involve at least six detention centers run by the National Directorate of Security, Afghanistan’s main intelligence agency, and three jails operated by the Ministry of Justice. NATO officials, who would not discuss the specifics of the report, said they would investigate the findings, which have also been turned over to Afghan government officials.

“With appropriate caution, I.S.A.F. has taken the prudent measure to suspend detainee transfer to certain facilities until we can verify the observations in a pending Unama report,” NATO said in a statement, referring to the NATO-led International Security Assistance Force.

Human rights groups have long complained about abuse and appalling conditions in the Afghan prison network. Those concerns have grown as the prison population has exploded, from 600 prisoners in 2001 to about 19,000 now, according to figures in a United Nations report.