African Union, US Envoy Warn of Sudan War Spillover into Chad; Khartoum Denies Responsibility for Convoy Strike

African Union Commission Chairperson Mahmoud Ali Youssouf on August 27, 2026 called on all parties to exercise 'utmost restraint' to prevent Sudan's civil war from spreading beyond its borders, without assigning blame for the August 20 strike on a convoy inside Chad's Ennedi-Est province. US Senior Adviser for Africa Massad Boulos said he was 'concerned about the war in Sudan spilling across its borders, fuelling further escalation and threatening regional peace' after discussing the incident with regional counterparts. Sudan's army had not publicly acknowledged responsibility for the strike; a Sudanese official said Khartoum was 'surprised' its forces had been blamed without an independent investigation, while noting Sudan has separately accused Chad of allowing RSF fighters and supplies to transit its territory. Chad kept its border forces on heightened alert.