The strikes are the first on the de-facto capital along the Red Sea. About a quarter of a million refugees have fled to the state where Port Sudan resides since the civil war erupted two years ago.

Sudan's paramilitary Rapid Support Forces launched a second drone strike in as many days on Port Sudan, targeting fuel depots in the eastern city early on Tuesday, security sources told Reuters, in a major escalation of a two-year-long conflict.

British maritime security firm Ambrey reported on Tuesday that the paramilitary Rapid Support Forces (RSF) had launched a drone attack on facilities at Port Sudan, targeting the container terminal and escalating a two-year-long conflict.