A drone strike on an army-run hospital in the southern Sudanese city of Dilling killed seven civilians and wounded at least 12 others Sunday, according to a health worker, as fighting intensifies in the restive Kordofan region.

The victims included patients and their companions, the medic said on condition of anonymity, explaining that the army hospital "serves the residents of the city and its surroundings, in addition to military personnel".

Dilling, in the flashpoint state of South Kordofan, is controlled by the Sudanese army but is besieged by rival paramilitary forces.

The greater Kordofan region is currently facing the fiercest fighting in Sudan's war between the army and the Rapid Support Forces (RSF), as both seek to wrest control of the massive southern region.

The RSF controls swathes of Kordofan along with their allies, the Sudan People's Liberation Movement-North (SPLM-N) faction led by Abdelaziz al-Hilu, which has a historic foothold in the region's Nuba Mountains.