The U.N.’s top human rights official warned on Thursday of “another wave of atrocities” in Sudan’s civil war as

paramilitary groups intensify an offensive on an oil-rich crucial region bordering Darfur.

In October, one of the groups, the Rapid Support Forces, seized the famine-stricken city of El Fasher from the Sudanese

military, unleashing widespread violence against civilians. Heavy fighting has now surged across the sprawling Kordofan

region, which connects central Sudan to Darfur.

“It is truly shocking to see history repeating itself in Kordofan so soon after the horrific events in El Fasher,” said

Volker Türk, the U.N. human rights chief. “We must not allow Kordofan to become another El Fasher.”

The region is important for both sides of the conflict. To regain its territorial foothold in Darfur, the Sudanese

military will need to secure key routes through Kordofan. Control of the region would allow the Rapid Support Forces to

build on its momentum and choke the flow of movement between the center of the country and Darfur.

Nearly 40,000 people have been displaced in the state of North Kordofan, according to the International Organization for

Migration, where paramilitary forces captured the city of Bara in late October. The U.N. has documented deaths from

aerial strikes, shelling and summary executions, and believes the number of civilian casualties is likely to be “much

higher” than what is being officially recorded.

In West Kordofan, the Rapid Support Forces said on Monday that it had claimed the town of Babnusa, a key economic

center. The Sudanese Armed Forces denied on Tuesday that it had lost control of Babnusa, saying that fighting was still

taking place.

And in South Kordofan, civilians in the towns of Kadugli and Dilling have been trapped in “siege conditions,” according

to UNICEF, with those trying to escape facing dangerous conditions.

The U.N. said it received reports of a drone strike by the Sudanese military in South Kordofan on Saturday, which killed

at least 48 people. Separately, the Sudan Doctors Network, a medical advocacy group, said in a statement on Thursday

that a strike by the Rapid Support Forces on a kindergarten killed at least nine people, including four children.

Sudan’s long-running civil war is widely considered one of the world’s worst humanitarian crises. The fighting has raged

for more than two years, forced 12 million people from their homes and left as many as 400,000 people dead, by some

estimates.