A man has died after being Tasered by police after officers were called over fears for his welfare.
The police watchdog said the man died after officers from the Dyfed Powys force were called out to an incident in Llanelli, south Wales.
In a statement, watchdog the Independent Police Complaints Commissio said: "Officers attended and, during engagement with the man, it is understood a Taser was discharged.
"The man became unresponsive and was subsequently pronounced dead. The IPCC has begun an independent investigation."
Police said they were called to concerns about the welfare of the man.
A spokeswoman for the force said: "Dyfed-Powys Police were called to an incident in Llanelli relating to the behaviour and welfare of a man. A man subsequently died.
"A full investigation has commenced and Dyfed-Powys Police referred the matter to the IPCC, who will now conduct an independent investigation.
"We are fully co-operating with them. Our thoughts are with the family of the man."
