Dyfed-Powys Police is investigating an assault which occurred at approximately 2am this morning, Sunday, 15th September, 2019 in Market St, Llanelli, outside Shakers nightclub.
A 22-year-old male has been taken to hospital and is described as being in a critical condition.
A 20-year-old male has been arrested on suspicion of assault and currently remains in police custody.
Anyone who witnessed the incident, or anyone who has information which could help the investigation is asked to contact police.
Police can be contacted by phoning 101 or information can be given anonymously to Crimestoppers on 0800 555 111. If you are deaf, hard of hearing, or speech impaired text the non-emergency number on 07811 311 908.