A BBC investigation has found that torture camps are being operated by Zimbabwe's security forces near the Marange diamond fields.

Victims have told the BBC's Hilary Andersson that prisoners are routinely subjected to rape and severe beatings and that some are mauled by dogs.

This comes as the EU is pushing for a partial end to a sales ban on Marange diamonds. The names of people in this report have been changed to protect their identities.

Hilary Andersson reports.