Passengers from Donegal who took the Letterkenny Bus Éireann service to Dublin on Friday had to disembark after the bus broke down during the journey.
The service experienced a breakdown near Sion Mills in County Tyrone.
A spokesperson for the company said: "The 11.20 Route 32 (Letterkenny– Dublin) service experienced a breakdown near Sion Mills, County Tyrone. The driver followed all safety procedures.
"A replacement bus was dispatched and passengers continued their journey to Dublin with a short delay. Bus Éireann would like to apologise for any inconvenience caused to our customers using the service."