Visits are continuing at jails in Northern Ireland despite an overtime ban by prison officers, the NIO has said.
There are some restrictions to jail regimes
A 48-hour ban began on Friday in a dispute over pay.
Officers are due to resume overtime on Sunday, but said they would withdraw "goodwill" next week.
A Northern Ireland Office spokeswoman said there were some restrictions to jail regimes.
"In each prison establishment visits are continuing to operate and this will be kept under review," she said.