The UN says nearly 100,000 people have fled clashes in South Sudan, between supporters of President Salva Kiir and those of his opponent, former deputy president Riek Machar.
The UN's aid chief in South Sudan, Toby Lanzer, said the conflict had resumed in the oil-rich Unity state, despite a ceasefire deal signed by the rivals in January.
The conflict, which began in 2013, has left over 10,000 dead and another 1.5mn displaced.
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