Sudan's army said its anti-aircraft systems intercepted drones on Wednesday targeting a naval base in the wartime capital Port Sudan. Explosions were heard in the city, though it was not immediately clear whether they were near the Flamingo base.

Amid reports that renewed drone strikes on a key Sudanese aid hub were thwarted late Wednesday, UN Secretary-General António Guterres added his voice to increasingly urgent calls for serious peace negotiations to end more than two years of war in Sudan.

A former Sudanese energy official warned that attacks on fuel depots in Port Sudan amount to a “war crime” and threaten the country’s already unstable fuel supplies.