South Sudan: Women raped under the noses of UN forces
10 June 2014 Last updated at 15:13 BST
Investigators believe that sexual violence is happening on a scale not seen before in South Sudan.
Claims of rape have been levelled at both government soldiers and rebel forces, but the allegations are extremely hard to verify.
Thousands of people from South Sudan now live in camps after a political dispute turned into a civil war.
Yet even here, under UN protection, women are not safe.
Karen Allen reports from a UN camp in the capital, Juba, for BBC Newsnight.