Prison visits in the North were conducted as normal today despite an overtime ban by warders in a row over pay.
As the 48-hour ban moved into its second day, a Northern Ireland Office spokeswoman said it had not had any major effects on day-to-day activity.
"There are some restrictions on the regime available in each establishment, but visits are continuing to operate and this will be kept under review," she said.
There are fears that the ban will create chaos in Northern Ireland's three jails if the dispute intensifies.
All 1,600 officers have launched a 48-hour overtime ban in an attempt to force new wage and pension negotiations.
Union chiefs have warned action will be stepped up unless the authorities return to the table. Staff are planning to withdraw their goodwill next week.
With officers only arriving at the gates right on clock-in time, the whole system could be slowed down. Inmates may also be late for court appearances.
Warders will not resume overtime until tomorrow at the high security Maghaberry complex near Lisburn, Co Antrim, Magilligan in Co Derry and Hydebank Wood young offenders' centre at Bangor, Co Down.
PA