A new U.N. fact-finding team examining abuses in Sudan's brutal civil war said Tuesday it was investigating reports of sexual slavery in detention facilities and ethnic-based attacks on civilians.

War has raged for more than a year between the regular military under army chief Abdel Fattah al-Burhan and the paramilitary Rapid Support Forces led by his former deputy Mohamed Hamdan Daglo.

The recently established U.N. Independent International Fact-Finding Mission had "received credible reports of many cases of sexual violence being committed by the warring factions," mission chief Mohammed Chande Othman told the U.N. Human Rights Council in Geneva.