Hopes of a quick agreement to end weeks of violence in South Sudan have been dashed, after talks in Ethiopia between the warring parties were delayed.
Teams representing President Salva Kiir and sacked deputy Riek Machar were due to meet face-to-face on Saturday. No new timings have been announced.
Heavy fighting is continuing in South Sudan. At least 1,000 people have been killed since 15 December.
More than 180,000 people have been displaced in the conflict.
Aid workers say many of them are living without shelter, clean water or sanitation.
There are reports of heavy fighting on the outskirts of the rebel-held city of Bor, in Jonglei state.
The government said its troops were attempting to recapture both Bor and the city of Bentiu, in the northern state of Unity. At the same time, rebel forces said they were advancing on the capital, Juba.
The US has said it remains committed to ending the violence, despite evacuating most of its embassy staff from Juba.
“Even as we draw down our personnel, the United States remains deeply and actively committed to supporting regional and international efforts to end the violence in South Sudan,” said State Department deputy spokeswoman Marie Harf.
Adapted From BBC