As Sudan's civil war intensified on Monday, top UN officials condemned the killing of dozens of children in drone strikes in South Kordofan state - and the targeting of first responders trying to help the wounded.
Aid delivery remains extremely difficult in violence-ridden areas, where clashes continue between the Sudanese army and the paramilitary Rapid Support Forces.
NPR's Ayesha Rascoe asks UN Under-Secretary General for Humanitarian Affairs and Emergency Relief Coordinator Tom Fletcher about his recent visit to Sudan.