Some 45,000 people have taken refuge in and around U.N. bases in the country and 81,000 people have fled their homes as a result of fighting that has raised fears of a civil war in the world's newest country.
The United States, Norway and Ethiopia are leading efforts to open peace talks between President Salva Kiir and the political rivals he accuses of mounting a coup.
The U.N. is investigating reports of mass killings.
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