Four people have been arrested at a prison in South Wales after concerns about the conduct of staff.
South Wales Police confirmed the four had been arrested on suspicion of assault and misconduct in public office.
The force said in a statement that the arrests followed reports of a series of incidents at HMP Parc.
Detective Chief Inspector Dean Taylor said concerns were raised on Wednesday.
“Officers are at the early stages of the investigation and are working closely with G4S while inquiries are ongoing,” he added.
The four people arrested as part of the investigation are a 23-year-old woman from Bridgend, a 45-year-old man from Pontcymer, a 25-year-old man from Merthyr and a 35-year-old man from Llanelli.
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