East African leaders will meet in Kenya to discuss the growing violence in South Sudan.
Its president, Salva Kiir, is facing an insurgency led by his former deputy Riek Machar.
Rebel forces took the strategic town of Bor last week, leading to thousands of refugees seeking sanctuary in the United Nations compound, before government troops retook it earlier this week.
The UN has responded with a promise of extra troops for the country.
Head of the UN Mission in South Sudan is Hilde Johnson:
“The military is overstretched with the current protection obligations related to the civilians in our camps and making sure that they are safe. We are also doing some patrols now, both day and night, in the neighbourhoods in Juba to try to create a more protective environment for people.”
Violence erupted 12 days ago. It is estimated more than 1,000 people have died.
The unrest is dividing the country along ethnic lines between the Nuer – Machar’s people – and the Dinka, to whom Kiir belongs.