Gardaí are appealing for witnesses following an alleged assault in Dublin city centre last night.
The unconscious man was discovered by a passerby on Dame Lane at about 11.30pm.
The man, in his late 30s, was found with serious head injuries close to the entrance of a pub.
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He was rushed to St James' Hospital before being transferred to Beaumont, where he remains in a serious condition.
Anyone who was in the Dame Lane area between 11pm and midnight has been asked to contact gardaí at Pearse Street station on 01 666 9000.