South Sudan Vice President Riek Machar traveled to Khartoum Saturday in an effort to lower tensions with northern officials. The visit comes as envoys from the north and south were also expected to meet in the Ethiopian capital, Addis Abbas, in an attempt to end the crisis.

    Southern Sudanese President Salva Kiir has called for a complete withdrawal of Sudanese government forces from Abyei saying the south did not want to return to war.

    Southern officials say some 80,000 people have been displaced by the fighting, while United Nations officials say tens of thousands of people are living out in the open, with little food or fuel.

    The U.S. Special Envoy for Sudan, Princeton Lyman, is heading to Qatar and then Sudan to discuss the Abyei situation.  He is expected to urge Sudanese officials to settle unresolved north-south issues before the south declares independence on July 19.

    Earlier this week, U.N. Secretary-General Ban Ki-Moon called on the African Union to stress to both sides a military showdown over Abyei is not an option.

    The two sides have been at odds over the future of Abyei, an oil-rich region located on the north-south border.

    Sudanese President Omar al-Bashir has said the north-south border region will remain in northern hands.(本文由在线英语听力室整理编辑)