Volker Türk issues a United Nations "red alert" as the Rapid Support Forces reimpose a blockade on El-Obeid and carry out repeated drone strikes that are killing civilians and destroying infrastructure.The United Nations documents at least 15 drone strikes in a recent three-week span that killed 45 civilians and injured 41, and says the siege-like conditions are producing severe shortages of food, fuel, water and health care for a city of about 500K, including roughly 100K refugees.Türk and aid agencies call for an immediate ceasefire and humanitarian truce and warn that the war that began in April 2023 has killed at least 59K, displaced about 13M and could force 500K more from El-Obeid unless humanitarian access is restored.