Detectives are investigating an altercation that took place outside a bar on Market Street in Ballymoney shortly after midnight.
Detective Sergeant Molloy said: “Two men were treated in hospital for injuries sustained during the incident. One of the men remains in hospital at present and is understood to be in a serious condition.
A third man, aged 38. Has been arrested and is assisting us with our enquiries.”
Witnesses or anyone with information can contact police on 101, quoting reference number 68 18/08/