Refugees fear eviction as military threatens action against rebels thought to be hiding in Kalma camp.
With less than a month left until Sudan’s referendum on independence, a joint military operation with neighbouring Chad is helping to calm tensions on the border.
Leaders of both countries had accused each other of harbouring rebel militias.
But now a joint patrol unit is working to secure the border region.
Al Jazeera’s Hoda Abdel Hamid has the story from Darfur.