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.

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.

Drones believed to have been launched by paramilitary Rapid Support Forces are said to have struck fuel depot.