WASHINGTON — The U.S. is working with other nations to end the conflict in Sudan, the White House said on Tuesday, after reports of mass killings during the fall of a city to paramilitary forces last week.

The Rapid Support Forces’ capture of Al-Fashir, the Sudanese army’s last holdout in Darfur, marked a milestone in the African country’s civil war, giving the paramilitary group de facto control of more than a quarter of the territory.

“The United States has actively engaged in efforts to bring about a peaceful resolution to the terrible conflict in Sudan,” White House press secretary Karoline Leavitt said.

International Criminal Court prosecutors said on Monday they are collecting evidence of alleged mass killings and rapes in Al-Fashir.

Hundreds of civilians and unarmed fighters may have been killed during the city’s fall, the U.N.’s human rights office said on Friday. Witnesses have described RSF fighters separating men from women and children, with gunshots ringing out afterwards. The RSF denies harming civilians.

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(Reporting by Nandita Bose and Maiya Keidan; Editing by Doina Chiacu and Paul Simao)