Dyfed-Powys Police is investigating a serious assault that has left one man in a critical condition.
The incident occurred in a property in Morgan Street, Carmarthen last night.
Police were called to the address at approximately 11.20pm and a 47 year old male victim was conveyed to Glangwili hospital with serious injuries.
One male has been arrested, and is currently in custody. Police are appealing for any witnesses.