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Nearly 500 young boys and men have been rescued from a "torture house" where they were chained up, abused and forced into slavery, say police.
Some of the boys and men had been held captive for years inside the building of horrors, which was advertised as an Islamic school, in Kaduna, Nigeria.
Victims as young as five had been tortured, sexually abused and starved while they were prevented from escaping, according to police, and there were signs they were being indoctrinated.
Many of the children had metal chains around their ankles and visible injuries, and one of those who saved claimed detainees had died.