Two further days of strike action are being planned by ambulance workers in Yorkshire.
The action follows a 24-hour walkout on April 2 in a dispute over the introduction of emergency care assistants to work alongside Yorkshire Ambulance Service’s paramedics.
It is claimed by the Unite union, which represents about 10 per cent of the service’s workforce, that the move would jeopardise patient care.
But Yorkshire Ambulance Service NHS said the claims were unfounded.
Unite regional officer Terry Cunliffe said the service was “going from bad to worse”.
“We have made a series of approaches to the trust’s executive and board members with Acas and independently, and they have not engaged with us,” he said.
“I want them to agree to meet with us in an attempt to resolve the dispute, end the industrial action, and to not cause further anxiety to the public.”
Mr Cunliffe said the dates of the walkouts had not yet been confirmed.