PORT SUDAN, Sudan, Dec 8, 2025 (BSS/AFP) - An engineer at Sudan's largest oil field said Monday that the paramilitary Rapid Support Forces had seized the facility along the country's southern border, forcing the evacuation of its staff.

Sudan's energy and petroleum ministry did not immediately respond to a request for comment on the reported capture of the Heglig field, located in the resource-rich Kordofan region.

"This morning the RSF took control of the field. Our technical teams shut it down and halted production, and the workers were evacuated to South Sudan," the engineer told AFP by phone from across the border.

Since April of 2023, the RSF has been waging a war with the regular army that has killed tens of thousands of people, displaced 12 million more and decimated the country's already fragile infrastructure.

The Heglig field is the country's largest, and is also the main processing facility for South Sudan's oil exports, which make up nearly all of Juba's government revenue.

"The processing plant near the field through which South Sudanese oil passes was also shut down," the engineer said on condition of anonymity because he was not authorised to speak to the media.

The army has repeatedly accused the RSF of launching drone strikes on Heglig, prompting authorities to temporarily suspend operations there in August.

Heglig lies in the far south of Sudan's Kordofan region, which has seen fierce fighting in recent weeks as the two sides wrestle for territory.

A drone attack in South Kordofan state blamed on the RSF hit a kindergarten and a hospital last week, killing dozens of civilians, including children, according to a local official and army-aligned foreign ministry.

In October, the RSF pushed army troops out of their last position in the western Darfur region, putting the military on the defensive as it tries to halt the paramilitary advance through Kordofan and back towards the capital Khartoum.

Sudan is now effectively split in two, with the army holding the north, east and centre, and the RSF in control of the west and, with the help of its allies, swathes of the south.