African Union investigators have released a report recounting a litany of horrors committed in the course of South Sudan's ongoing civil war, including routine gender-based violence and the indiscriminate killing of civilians.
The recruitment of children younger than 15 years is a war crime according to the Geneva Conventions and the International Criminal Court.
Violence is worsening in South Sudan amid fears that ethnic killings are "spiraling out of control" and calls for sanctions grow.
The conflict in South Sudan is growing increasingly indiscriminate, as armed groups use radio broadcasts to encourage attacks on civilians.
A mob of several hundred people assaulted a UN base in the city of Bor on Thursday and opened fire on civilians inside, killing 48.
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Sudan has accused its neighbor of attacking its citizens in the disputed Abyei region, but South Sudan also faces a civil war.