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South Sudan conflict 'spreading around the country'

24 December 2013 Last updated at 11:51 GMT

New evidence is emerging of alleged ethnic killings committed during more than a week of fighting in South Sudan.

The violence follows a power struggle between President Salva Kiir, a Dinka, and his Nuer ex-deputy Riek Machar.

The BBC's Africa analyst James Copnall reports.