Marange could represent as much as a fifth of the world's diamonds depositsA torture camp run by Zimbabwe's security forces is operating in the country's rich Marange diamond fields, BBC Panorama has found.
The programme heard from recent victims who told of severe beatings and sexual assault.
The claims come as the European Union pushes to let some banned diamonds from the country led by President Robert Mugabe back onto world markets.
The Zimbabwean government has not responded to the BBC's findings.
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