Dyfed-Powys Police is investigating after a man suffered a serious injury in Station Road, Burry Port.
Officers were called to a report that the man had suffered an injury at around 10.45pm on Saturday, 24 September. He has been taken to hospital.
A 39-year-old man was arrested at the scene on suspicion of assault. He remains in police custody.
A road closure is in place for scene preservation and is likely to remain for a number of hours.
Anyone with information that could help officers with their investigation is asked to report it to Dyfed-Powys Police, either online at https://bit.ly/DPPContactOnline, by emailing email@example.com, or by calling 101. If you are deaf, hard of hearing, or speech impaired text the non-emergency number on 07811 311 908. Alternatively, contact the independent charity Crimestoppers anonymously by calling 0800 555111, or visiting crimestoppers-uk.org. Quote reference: DP-20220924-360.