The paramilitary capture of El-Fasher, Sudan's oldest capital and Darfur's historic heart, sparked fears Tuesday of mass killings reminiscent of the region's darkest days. After an 18-month siege marked by starvation and bombardment, the city is now under the control of the Rapid Support Forces (RSF) -- descendants of the Janjaweed militias accused of genocide two decades ago. FRANCE 24 speaks with Dr Jan Pospisil of Coventry University's Centre for Peace and Security.