The investigation into alleged historical sexual and physical abuse at Medomsley Detention Centre in County Durham comes a decade after an earlier investigation that led to the conviction and jailing of two former members of staff, Neville Husband and Leslie Johnson, who have since died.
Durham Constabulary said around one third of the 915 men who had contacted the latest investigation, which is named Operation Seabrook, reported being sexually assaulted by either Husband or Johnson.
The Operation Seabrook team has questioned four former members of staff who were prison officers at Medomsley during the 1970s and 1980s and have since retired, police confirmed.
All four were interviewed under caution, but not arrested, and could be interviewed again in future.
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