Police have referred themselves to a watchdog after it took up to 46 hours to find five friends who were victims of a crash that killed three.

South Wales Police said in a statement: ‘Referrals have been made by Gwent Police and South Wales Police to the Independent Office for Police Conduct.

‘The last confirmed sighting of the five was during the early hours of Saturday morning.’

Assistant Chief Constable Jason Davies of South Wales Police said: ‘Our thoughts are with the families of all those affected by this tragic incident. 

‘Specialist officers are carrying out an investigation to piece together what has happened. 

‘Family liaison officers are supporting the families involved at what must be a hugely difficult time for them.

‘To ensure independent oversight, South Wales Police has referred the matter to the Independent Office for Police Conduct, as is usual in these circumstances.’

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Three people died in the crash.