The final results of Southern Sudan's referendum on independence are due to be announced.
Provisional results showing nearly 99% in favour of dividing Africa's biggest country are expected to be confirmed.
January's referendum was agreed as part of a 2005 peace deal ending more than two decades of civil war between the south and north Sudan.
Although the vote was peaceful, tension remains high in parts of the oil-rich border region.
At least 50 people were killed over the weekend in fighting between soldiers in south Sudan's Upper Nile state.
The clashes broke out between northern troops in a dispute over who keeps the heavy artillery as equipment is moved north of the new border.
The fighting began late last week in the state capital Malakal, spreading to the towns of Paloich and Melut over the weekend. BBC News
