Ambulance Staff, who were due to strike today must continue working due to a major incident being declared.
The Ambulance Service had said that they would respond to life-threatening emergencies, but the areas of Londonderry, Belfast, Omagh, Lisburn and Enniskillen were reportedly left without any Ambulance staff.
Unison called the a move a “complete breach of faith” and said it would likely provoke further action.