Medics in Sudan’s East Darfur state say more than a dozen children have starved to death in the Lagawa refugee camp amid a cholera outbreak, heat waves and flooding in the region. The U.N. says more than 15 million people have been displaced since the start of Sudan’s civil war in April 2023, making it the world’s worst humanitarian crisis. This week, the Sudanese paramilitary group the Rapid Support Forces formally announced it had established a rival government headquartered in the city of Nyala. The African Union has condemned the move. On Wednesday, U.S. Secretary of State Marco Rubio postponed a meeting of foreign ministers aimed at advancing peace talks between Sudan’s warring military factions.