Sudan's army has seized an oil-rich border region in what southern Sudan described as a declaration of war.

A lack of basic healthcare means Médicins Sans Frontières in Southern Sudan treats many suffering from preventable illnesses.

Fighting between the army and Darfur rebel groups is intensifying ahead of a referendum on southern independence that could change the map of Sudan.

Sudan says it will expel some international aid workers from Darfur, while plan are afoot to transform some Southern Sudan cities into animals shapes.

Soon, Southern Sudan's humanitarian disaster could dwarf that of its neighbour Darfur.

Uganda's top rebel leader, Joseph Kony, was expected to sign an historic peace deal on Thursday to end one of Africa's longest and most brutal civil conflicts. The Lord's Resistance Army chief was due in the southern Sudan jungle town of Ri-Kwangba to initial an agreement that is to be signed separately by Ugandan President Yoweri Museveni four days later.