South Sudan town of Bor seized by rebels
19 December 2013 Last updated at 11:03 GMT
The army in South Sudan says rebel forces allied to the former vice-president Riek Machar have seized control of the key town of Bor.
The unrest, which began in the capital Juba, has already killed 500 people and sparked fears of a civil war.
President Salva Kiir has accused Mr Machar of staging a coup - a claim he denies.
Thousands of people are seeking refuge from the fighting in UN compounds.
The BBC's Africa security correspondent, Moses Rono is following the story in neighbouring Kenya.