The UN Security Council on Saturday expressed its “deep concern” over an imminent attack on al-Fashir in Sudan’s North Darfur State by the Rapid Support Forces (RSF).

War erupted in Sudan one year ago between the Sudanese army and the paramilitary Rapid Support Forces (RSF), creating the world’s largest displacement crisis.

Despite efforts to resolve the conflict, including mediation by Saudi Arabia and the US, the conflict in Sudan has led to extensive casualties, displacement and a dire humanitarian crisis.

Al-Fashir is the last major city in the vast, western Darfur region not under control of the RSF. The RSF and its allies swept through four other Darfur state capitals last year, and were blamed for a campaign of ethnically driven killings against non-Arab groups and other abuses in West Darfur.

In a statement, the Security Council, “expressed their deep concern over an imminent offensive by the Rapid Support Forces and their allied militias” against the city of al-Fashir.

The Council urged the military and Rapid Support Forces to deescalate tensions and fulfill their obligations under international law, particularly emphasizing the imperative of maintaining peace in Fashir.

Top UN officials warned the Security Council last week that some 800,000 people in al-Fashir were in “extreme and immediate danger” as worsening violence advances and threatens to “unleash bloody intercommunal strife throughout Darfur.”