Prison officers across Northern Ireland could go on strike on Christmas Day.
Seventy per cent of officers balloted recently voted in favour of industrial action over pay.
It's illegal for prison officers to walk out but the ballot question asked members if they supported industrial action up to and including strike action.
It was carried out among officers at Maghaberry and Magilligan jails.
The Prison Officers Association says it will continue to work to rule.

James Nesbitt ‘in awe’ of Christmas efforts at Marie Curie Hospice
Michelle O’Neill to tackle Starmer for ‘prioritising weapons of war over people’
Vaccination appeal amid ‘very concerning’ increase in flu cases
Police probe report of shot fired at a house in Newry
MLAs clash with officials over Bill to make school uniforms more affordable