Police are appealing for witnesses after an assault at the Vista Lounge, Murray St, Llanelli.
A 52 year old male was taken to hospital with serious injuries.
Dyfed-Powys Police sats the attack happened at around 12.30am Sunday December 24th
A 36 year old male has been arrested and is police custody.
Officers say there were a lot of people in the area at the time and are appealing for anyone who witnessed the incident to contact Llanelli police on 101.