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In Sudan voting has continued for a fourth day in the week-long referendum. Officials in the south say the voter turnout has already reached more than 60 per cent.

That is the number needed to validate the results of a vote that could split the country in two.

There have been reports of troop build-up along the north-south border.

Nick Clark travelled to the sensitive South Kordofan to investigate.

Source: Al Jazeera