Up to 70 detectives have been involved in the investigation into alleged physical and sexual abuse at a former detention centre in County Durham, police have confirmed.
Det Supt Paul Goundry, who is leading Durham Constabulary's Operation Seabrook, said there was "still a huge amount of work which has to be done" in the investigation.
He confirmed his team had been in "close contact" with the Crown Prosecution Service, who will ultimately decide if there are grounds to charge individuals with criminal offences.
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