Over 28,000 are based in the capital Juba, where aid workers are trying to stamp out a cholera outbreak that has killed at least 32 people since cases were first recorded last month, including inside the UN base.Another 91,500 are sheltering in Bentiu, capital of the northern battleground state of Unity, where a UN report last month described how South Sudan’s army raped then burned girls alive inside their homes during a recent campaign marked by “new brutality and intensity”.