UN relief chief Tom Fletcher on Thursday warned of horrific levels of violence and suffering in Sudan as El-Fasher has descended into ldquo;an even darker hellrdquo; following its capture by the Rapid Support Forces (RSF). El-Fasher, already the scene of catastrophic levels of human suffering, has descended into an even darker hell, with credible reports of widespread executions after Rapid Support Forces fighters entered the city, Fletcher told the Security Council....