Satellite images show that the rebel Sudanese RSF group has built 31km of fortifications around the last government stronghold in Darfur, as it carries out atrocities in the city's suburbs. The researcher who made the findings says the group is creating a 'kill box' around el-Fasher, while a doctor trapped inside says there is so little food in the besieged city that his hospital cannot feed the children they treat.

Also in the programme: Yemen's Houthi movement confirms that Israel has killed their Prime Minister and other senior figures in an air strike; and we speak to the researchers behind a ground-breaking AI powered stethoscope.

(Pictured:A satellite image of Alsen village, west of el-Fasher, taken on 6 July. Right: An image from 24 July showing a segment of the berm constructed through the settlement; Credit: Maxar Technologies)