A heart attack is one line of inquiry being followed for contributing to a fatal bus crash in Cork on Tuesday.
A local priest has been confirmed as one of two people killed in the crash on the Strand Road in Monkstown.
Fr Con Cronin, who was aged in his 60s, was struck by a Bus Éireann bus which veered out of control at around 1.30pm.
The bus also hit a number of parked vehicles during the incident.
Mark Wills, the driver of the bus aged in his 50s, also died.
Gardaí are following a line of inquiry that indicates the driver suffered a medical trauma and lost control of the vehicle.
Gardaí in Togher are appealing for any witnesses to this collision to come forward.
A full mechanical examination of the bus is also due to be carried out.
Southern correspondent with the Irish Independent, Ralph Riegel, told Newstalk Breakfast a quick-thinking passer-by also saved a teenage girl.
"The local curate, Fr Con Cronin, it's believed he was having lunch locally and he was walking either to his car or towards his home and he was caught by this coach as it came by.
"A man was also nearby and he saw what was going to happen, and had the split-second response to shove a teenage girl out of the way.
"So both of those only suffered cuts and bruises.
"There are two investigations underway at the momennt: there's an investigation by Bus Éireann into what happened and there's also a Garda investigation.
"The main theory at the moment is that the poor driver of the bus had some type of a medical emergency, possibly a heart attack, which incapacitated him and resulted in the bus then veering across the road the way it did.
"Bus Éireann issued a statement last night extending their sympathy to everybody who was involved in this, but also saying how shocked they were at the nature of the incident that involved one of their employees".
Fr Cronin had previously worked in Nigeria, England and Scotland.
Anyone with any information is asked to contact Togher Garda station on 021-494-7120, the Garda Confidential Line at 1800-666-111 or any Garda station.