The BBC's Africa correspondent Barbara Plett Usher spoke to two doctors who support claims that paramilitary fighters systematically destroyed healthcare facilities in el-Fasher, Darfur, during a prolonged siege that ended with the city's fall a year ago.
The doctors described the targeting of hospitals, which under international law is illegal, as health facilities and their staff are protected during conflict. UN human rights chief Volker Türk called the findings "deeply disturbing."
However, Dr Alaa Eldin Nugud, the health minister of the group's civilian-affiliated government, dismissed the allegations as propaganda. The investigation highlights the devastating toll on civilians in a region already scarred by years of conflict.