PORT SUDAN — Sudan's army-aligned government on Tuesday severed diplomatic ties with the United Arab Emirates, accusing the Gulf state of supplying weapons used by the rival paramilitaries to strike its de facto capital.

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.