SIPTU wants action taken to improve safety after a Dublin Bus driver was threatened with a gun.
He was waiting to start driving a number 13 bus at Mountjoy Square on Friday night when a man got on board brandishing a gun.
He allegedly pointed the gun at the driver, before leaving.
Dublin Bus says no customers were on board at the time and it's liaising with Gardaí.
The 13 and 7a bus routes are not serving Mountjoy Square after 7pm until further notice, as a result.
SIPTU Transport Sector Organiser John Murphy describes what happened: