Friday's attack in the city of el-Fasher has been blamed on the paramilitary Rapid Support Forces (RSF), but the group has not taken responsibility. The RSF and the army have been engaged in a ferocious civil war for more than two years. The paramilitaries are gaining ground as they fight to seize complete control of el-Fasher - the last army stronghold in Darfur and home to more than 300,000 civilians who have been trapped by the fighting.

One resident told the BBC the drone struck during morning prayers, killing dozens of people instantly. The medical source said 78 died and about 20 were injured, but the process of extracting the bodies from the rubble of the building was still ongoing. BBC Verify has authenticated footage showing around 30 bodies wrapped in shrouds and blankets next to the mosque, which was located in the west of the city. This week the RSF launched a renewed offensive on El Fasher, which it has besieged for more than a year. Reports say this included fierce attacks on Abu Shouk, a camp for displaced people near the city.

Satellite images suggest RSF units now control much of the camp, according to Yale University's Humanitarian Research Lab (HRL), which monitors wars. According to the unit, satellite pictures also show the RSF has entered the headquarters of the Joint Forces, a collective of armed groups allied to the Sudanese army. The headquarters is located in a former UN compound, considered to be a critical line of defence. The BBC has verified footage showing RSF fighters inside the expansive complex, although it is not clear whether they have seized full control. These apparent advances would place el-Fasher's airport and the army's division headquarters within direct RSF firing range. (BBC)