The chief executive of Translink has said there is "no clear way forward" on how cross-border buses will operate in the event of a no-deal Brexit.
Chris Conway told a House of Lords Committee that Translink currently did not know how services not covered by the Interbus Agreement - which permits buses to travel between EU states and neighbouring countries - would continue if the UK and EU fail to reach a deal before Brexit occurs in March.
He told the committee that the Interbus Agreement only covers "occasional services" out of the 70 which cross the border, and that several services "meander" over the border several times along their route.
"At the moment we don't have a clear way forward on how we would actually operate those services," he said.
Sinn Féin MEP Martina Anderson claimed the loss of cross-border services would be "disastrous", and said: "This demonstrates how badly communities both north and south will be hit by Brexit and underlines the need for the north to secure special status and remain in both the customs union and single market."
