South Sudan's President Salva Kiir (left) and rebel leader Riek Machar (right) shake hands and pray before signing an agreement of the cease-fire of the South Sudan conflict on Friday in Addis Ababa, Ethiopia. Elias Asmare/AP hide caption

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South Sudanese fleeing an attack on the town of Rank, on Saturday. The United Nations says when rebels seized the town of Bentiu, south of Rank, earlier this month, hundreds became victims of ethnically targeted killings. Mohamed Nureldin Abdallah/Reuters/Landov hide caption

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South Sudan's government-delegation leader Nhial Deng Nhial (left) and the rebel-delegation leader Taban Deng Gai shake hands after signing a cease-fire agreement in Addis Ababa, Ethiopia, on Thursday. STR/EPA /Landov hide caption

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A young, displaced girl cries after the relative she was with disappears into a row of latrines Sunday at a U.N. compound in Juba, South Sudan. Violence in the country has forced an estimated 70,000 people to take refuge in U.N. compounds. Ben Curtis/AP hide caption

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Tens of thousands of refugees are flocking to United Nations compounds like this one in Juba, while fears fester that fighting in the capital will resume. Tony Karumba/AFP/Getty Images hide caption

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South Sudanese seek refuge at the United Nations compound in the capital, Juba, on Sunday. Though Juba is mostly peaceful now, growing numbers are seeking shelter at the compound in fear the ethnic killings will resume. Tony Karumba/AFP/Getty Images hide caption

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South Sudanese pan for gold in Nanakanak, in the eastern part of the impoverished country. Tens of thousands of informal miners are looking for gold, and the government is trying to attract international mining companies to carry out the search on an industrial scale. Hannah McNeish/AFP/Getty Images hide caption

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