About 100 thousand Nubians live in Kibera, one of the biggest slums in Africa.
Kibera's population is made up of almost 1 million people from different parts of Kenya.
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.