Aid workers in war-torn South Sudan have reached one of the worst hit areas where thousands are feared dying of starvation, the United Nations said Tuesday, but warned conditions may yet worsen.

Two teams of aid workers reached the town of Leer in southern Unity state, the U.N. said, scene of some of the heaviest fighting, including the mass abduction and rape of women and children.

In October, U.N.-backed experts warned of a "concrete risk of famine" in parts of Unity state before the end of the year if fighting continues, but there has been no let up in the conflict.

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