A prisoner led by a G4S security guard at Mangaung prison in South Africa
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South Africa G4S prison staff accused of abuse

28 October 2013 Last updated at 19:42 GMT

Staff at one of South Africa's most dangerous prisons, run by British firm G4S, have been accused of "shocking" abuses and of losing control.

The South African government has temporarily taken over the running of Mangaung prison from G4S and launched an official investigation.

It comes after inmates claimed they had been subjected to electric shocks and forced injections.

G4S says it is investigating the allegations.

Andrew Harding's report contains disturbing leaked footage from inside the prison.