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UN's Ban Ki-moon warns over South Sudan violations

23 December 2013 Last updated at 20:17 GMT

Allegations of rights violations in South Sudan will be investigated, and those responsible will be held to account, the UN secretary general says.

Ban Ki-moon urged leaders on both sides to find a political solution.

Tens of thousands of people have fled fighting, as rebels thought to support sacked former vice-president Riek Machar have seized major towns.

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