A man sustained serious injuries in a random attack in Dublin city centre.
The victim was attacked shortly after leaving a pub in the Dame Lane area of Dublin's city centre at around 11.30pm on Saturday.
It is understood that the victim, said to be in his late thirties, was struck once in the attack on Dame Lane and fell to the pavement.
Gardaí do not believe that the attacker was known to the victim prior to the assault.
Gardaí are looking at a number of different enquiries - it is understood the attack was not linked to the Gay Pride events that took place in the city centre earlier that day.
Detectives hope to speak to the victim soon as he recovers.
A suspect for the attack is known to gardaí and the man was being sought for questioning by gardaí last night.
The victim was rushed by ambulance to the nearby St James's Hospital in the south inner city.
He was later transferred to Beaumont Hospital, which specialises in treatment for head injuries.
He was in a critical condition initially - however, his condition has since improved and stabilised. He is expected to recover from his injuries.
Gardaí are appealing for witnesses to the violent attack to come forward.
A garda spokesperson said: "Gardaí were alerted to the discovery of an unconscious man by a member of the public at about 11.30pm.
"The man in his late 30s was found with serious head injuries, close to the entrance of a pub on Dame Lane."
"Medical assistance was sought and the man was taken to St James's Hospital and has since been transferred to Beaumont where he remains in a serious condition," said the garda spokesman.
Gardaí are appealing for anyone who was in the very popular Dame Lane area between 11pm and 12 midnight on Saturday night to contact them at Pearse Street Garda Station on 01 666 9000.
A source in Dublin Fire Brigade said the brigade's ambulance service dealt with a number of assault victims in the city centre on Saturday night.