Explosions and fires rocked Sudan’s main port city and wartime capital Port Sudan on Tuesday, a witness said, part of a days-long drone assault that has torched the country’s biggest fuel depot, damaging the most important gateway for foreign aid.

Sudanese military officials say paramilitary fighters unleashed drones on the Red Sea city of Port Sudan, hitting key targets there, including the airport, the port and a hotel.

Port Sudan is the main entry point for humanitarian aid into Sudan. A spokesman for UN chief Antonio Guterres said the drone strikes 'could lead to large-scale civilian casualties and further destruction of critical infrastructure.