Toby Lanzer,, UN humanitarian co-ordinator
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S Sudan: UN 'evacuating wounded'

23 December 2013 Last updated at 12:05 GMT

A UN official in South Sudan has spoken of an atmosphere of fear and desperation as violence escalates.

Humanitarian aid co-ordinator Toby Lanzer told the BBC about the situation in the town of Bor, which has been seized by rebel soldiers.