Police have arrested an eleventh person in connection with allegations of abuse and mistreatment of young people at the Medway Secure Training Centre in Kent.
A 26-year-old from Canterbury was detained on Friday on suspicion of misconduct in public office and is in police custody.
Following five arrests in January, Kent Police held a further five people on June 8 over claims of abuse at the G4S-run centre in Rochester.
The arrests came in the wake of a damning documentary allegedly showing staff mistreating and abusing young inmates, and boasting about using inappropriate techniques to restrain children.
Other allegations included claims that staff tried to hide their actions by ensuring they were beneath CCTV cameras or in areas not covered by them.
Last month, Justice Secretary Michael Gove announced the Government would take over the running of the facility through the National Offender Management Service by the end of July.
In February, G4S announced it was selling its UK children's services business, which includes 13 children's homes and two STCs - Medway and Oakhill in Milton Keynes.