JUBA, Sudan — About 34,000 southern Sudanese have fled their homes after tribal clashes over land, water and cattle in recent weeks, a U.N. humanitarian official said, adding to southern troubles before independence in July.

"The oil-rich south voted overwhelmingly to separate from the north in a January referendum, promised as part of a 2005 peace deal that ended decades of civil war in Sudan. At least two million died in the war, which destabilized much of the region."

A former Republican congressman was due to meet with Moammar Gadhafi Wednesday in a bid to persuade the Libyan leader to step down and allow democratic elections.