Sudan's army said paramilitary forces launched drone strikes on Thursday targeting a northern town housing a major dam, while fighting between the foes raged in the strategic region of Kordofan.

The violence comes after the Group of Seven (G7) sounded the alarm on Wednesday over the "recent escalation of violence" in Sudan's war, which erupted more than two and a half years ago.

The war between the army and the paramilitary Rapid Support Forces has killed tens of thousands of people, displaced nearly 12 million more and triggered one of the world's worst humanitarian crises.

The violence has escalated dramatically in recent weeks, with the RSF seizing control of the key town of El-Fasher and with reports of atrocities multiplying.

On Thursday, drones "targeted the army headquarters, the airport and the Merowe Dam," an army statement said, adding that it had intercepted the attacks that it blamed on the RSF.

Merowe is in an area that has been under army control for months.

The town, about 330 kilometres north of the capital Khartoum, was plunged into darkness after a full power cut.

The RSF has increasingly resorted to drones in recent months, though the military also uses drones to conduct strikes.

In late October, the RSF captured El-Fasher, the last army stronghold in the vast western Darfur region, consolidating its hold over the area.

According to the International Organisation for Migration, 90,000 civilians have fled El-Fasher since it fell under paramilitary control. (AFP)