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Satellite images have shocked investigators and human rights groups, exposing evidence of mass killings and bloodshed visible from orbit. Now, those same images are offering a stark warning as Sudan's catastrophic war moves towards the city of El Obeid.

With half a million civilians, many already displaced, facing the threat of becoming trapped by new defensive earthworks, humanitarian groups are urging urgent action to prevent another deadly episode.

As both sides prepare for battle, experts say El Obeid could become the site of Sudan’s next mass atrocity. Watch the video to find out more.