There are claims some ambulance workers from the North could not assist in an explosion across the border in Donegal because of visa issues - however they have been rejected by the North's ambulance service
Ten people died in the incident at a petrol station in Creeslough on October 7th, last year.
It was revealed at The British-Irish Parliamentary Assembly yesterday that some ambulances from Derry could not help because "some paramedics did not have the necessary visas" to cross the border.
Emergency services from the North assisted in the Creeslough explosion, including fire crews, search and rescue teams and the air ambulance.
However, some ambulance crews based at Altnagelvin Hospital in Derry could not cross the border a few kilometres away because of issues with the Common Travel Area (CTA).
The CTA is an agreement that allows British and Irish citizens to travel freely into each other's countries.
However, those rights do not extend to migrants living on either side of the border, so some migrants who work for the emergency services could not travel to County Donegal.
The North's Ambulance Service is denying the claims.
