Arab villages. The uprising follows years of clashes over scarce resources in the vast arid region. Peace talks held in Nigeria have stalled. The WFP called on rebels to return 13 recently stolen aid trucks which it fears are being used for military purposes. "Such misuses of humanitarian assets should cease immediately," said Jan Pronk, the U.N.'s special envoy to the region. "The parties to the conflict have to live up to their commitments, including their responsibility to ensure the safety and wellbeing of their own people and their unhindered access to humanitarian assistance". --SP 2247 Local Time 1947 GMT