The strike was carried out by the Sudanese Armed Forces.
In a statement, Guterres says he is appalled by reports of large-scale violence and casualties across the Darfur region, expressing concern also at reports of renewed fighting in North Kordofan, South Kordofan and Blue Nile States, as the conflict only expands beyond the capital Khartoum.
Guterres warned that, the ongoing conflict between two military factions had pushed Sudan to the brink of a full-scale civil war, potentially destabilizing the entire region.
He appealed for the Sudanese Armed Forces and the Rapid Support Forces to cease fighting and commit to a durable cessation of hostilities.