Fighting around Sudan’s largest oil refinery has set the sprawling complex ablaze, sending thick, black smoke over the country’s capital, Khartoum.

Sudan’s military says its leader, Gen. Abdel-Fattah Burhan, has survived a drone attack on an army graduation ceremony he was attending in the country’s east.

Sudan’s paramilitary leader has announced plans to attend cease-fire talks in Switzerland next month arranged by the United States and Saudi Arabia.