SOME 800,000 people in a Sudanese city are in "extreme and immediate danger" as worsening violence advances and threatens to "unleash bloody intercommunal strife throughout Darfur," top U.N. officials warned the Security Council. War erupted in Sudan one year ago between the Sudanese army (SAF) and paramilitary Rapid Support Forces (RSF), creating the world's largest displacement crisis. U.N. political affairs chief Rosemary DiCarlo told the 15-member Security Council that clashes between RSF and SAF-aligned members of the Joint Protection Forces were nearing El Fasher, the capital of North Darfur. "Fighting in El Fasher could unleash bloody intercommunal strife throughout Darfur," DiCarlo said, echoing a warning by U.N.…