By Max Delany
Abyei is a town used to living on the edge. Local residents wade ankle-deep in mud past bombed-out buildings and the carcasses of buses, a scenery of destruction that has become part of their everyday existence. Life like this seems close to normal after years of war between Sudan's government and southern rebels over who would control this town and the rich oil fields that surround it. But any calm has been precarious, with Abyei along one of the most hotly disputed borders on the planet- the phantom line dividing northern Sudan from the semi-autonomous South. Some of Sudan's most prized oil fields are just north of here.