Detectives investigating allegations of historical sexual and physical abuse on inmates at County Durham Young Offenders' Centre have begun interviewing former staff.
The alleged abuse took place between the 1960s and when the centre closed in 1988.
Since August last year, 915 former inmates have contacted police to report they were the victims of physical or sexual assaults.
The man whose allegations of historical abuse at a Home Office-run young offenders' centre in County Durham has led to hundreds more former detainees reporting their own abuse has said he expects "more will come forward".
Abuse victim John McCabe told ITV News he was "not surprised" that more than 900 men have come forward after the launch of a special police investigation into the defunct Medomsley Detention Centre in August 2013, which has led to former prison staff being interviewed under caution.
ITV News North of England Correspondent Damon Green reports:
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