Increase in North Sudanese Armed Forces in Abyei

Satellite images are tracking a build-up of forces in the North Sudanese district of Abyei, where a referendum on joining an independent South Sudan was blocked by violence. Although the referendum in the district was agreed to by both North and South Sudan, Abyei has significant oil reserves and North Sudan is reluctant to lose it in addition to the substantial South Sudanese reserves. More here.