 The city of El Fasher is the Sudanese military's last foothold in the western region of Darfur, and that makes it one of the epicentres of the country's civil war. It's in the grip of a punishing battle between the army and the paramilitary rapid support forces, or RSF, and it's a city under siege. A local cameraman, Mohammed Zakaria, had been sending the BBC footage from El Fasher, but at the beginning of June he decided it was too dangerous to stay.