Gardaí in Cork last night were investigating an incident that led to a man being placed on a life support machine after he was rescued from the River Lee yesterday evening.
The man in his late 40s from the south side of Cork city had been drinking with other people near the south channel of the river when a row broke out.
Gardaí were last night trying to establish if he had been pushed into the river.
He was removed unconscious from the water by the fire brigade and taken to Cork University Hospital where he was last night placed on a ventilator. His condition was described as "critical".
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A man in his 40s and a woman in her 20s were arrested near the scene.