The Justice and Equality Movement rebel group is a powerful force in Sudan, with a large array of weaponry and trucks.
The group says it wants to create a new country - the United Regions of Sudan (URS) - and redistribute local wealth more fairly.
Al Jazeera's May Welsh reports exclusively from the Chad-Sudan border.
Sudan's governemnt has accused Darfur's largest refugee camp of harbouring rebel fighters. The Kalma camp is the only one that is permanently protected by United Nations and African Union forces, but residents fear they may be driven out as the military threatens to take action. Al Jazeera's Hoda Abdel-Hamid reports from the camp.