KHARTOUM, Sudan /ISTANBUL At least 21 people were killed and 47 others injured in a drone strike by the Rapid Support Forces (RSF) targeting the prison in El-Obeid, the capital of North Kordofan state in southern Sudan, the Sudan Doctors Network said on Saturday. “This deliberate assault on a civilian facility marks a grave escalation in the ongoing violence in the region,” the non-governmental network said in a statement. The prison houses nearly 5,000 inmates, it added. Meanwhile, government