Forensic examinations are continuing following the death of a 24-year-old man from Cardiff in the early hours of this morning.
Emergency services were called to a flat in the Llanrumney area of the city just after 1am.
The man was taken to hospital, where he later died.
Police have arrested a 53-year-old man on suspicion of murder.
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Feeling humid with heavy showers and thunderstorms moving north overnight into Sunday.
Four people, including three children, were taken to hospital to be checked for smoke inhalation.
Heavy rain and thunderstorms will affect many parts of Wales this weekend - particularly during Saturday evening.