Gardaí and the HSA are investigating the incident, which occurred yesterday evening.
A number of investigations are underway following a fatal bus crash in Westmeath.
The driver was killed and a number of passengers were injured after the vehicle left the road and collided with a ditch in Killogeenaghan, Moate at around 5.30pm yesterday evening.
The coach was travelling from Athlone to Drogheda at the time of the incident.
Gardaí are examining the scene this morning, and the Health and Safety Authority have confirmed they are making enquries.
Bus Éireann is expressing its sympathies to the friends and family of the driver who died in the crash.
Stephen Kent, Chief Executive Officer, Bus Éireann says:
"This is a very sad event, affecting everyone in Bus Éireann. Our thoughts and deepest sympathies are with the family and friends of our colleague who received the worst possible news last night. We thank the emergency services for their work and their assistance to our colleague and to all the passengers affected by this difficult experience.
The coach was travelling from Athlone to Drogheda, carrying approximately 20 passengers. All passengers disembarked safely, with no major injuries reported. A number were medically assessed at the scene and others transferred to local hospitals. Bus Éireann staff were on hand to organise onward travel for those who may have required it."
Sergeant at Athlone Garda Station, Andrew Haran, says it's not yet clear what caused the bus to leave the road:
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