'Atmosphere of fear' in South Sudan town of Bor, says UN

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 summary executions in Bor, in the restive state of Jonglei that has fallen to rebels.

The UN mission in South Sudan has urged rival political leaders to agree a truce and open negotiations.

Clashes broke out between troops loyal to President Salva Kiir and others backing his former deputy a week ago.

James Copnall reports.