South Sudan rebels 'take key state' of Unity
22 December 2013 Last updated at 23:05 GMT
The United Nations mission in South Sudan has said it is relocating all non-critical staff from the country amid escalating violence.
The UN says more than 60,000 people have fled their homes since clashes erupted a week ago.
UN Secretary-General Ban Ki-moon has repeated calls for an end to the fighting which appears to be largely along ethnic lines.
Former South Sudan Vice-President Riek Machar says rebel troops have captured the key oil-producing state of Unity and control much of the country.
Emily Buchanan reports.