More than 10,000 people displaced by fighting in Sudan's Southern Kordofan were staying near a UN compound on Thursday, the country mission spokesman said, after nearly a week of clashes in the tense border state.

Fighting between government forces and armed groups erupted in the state capital of Kadugli and elsewhere after a police station was attacked on Saturday, adding to tensions as the country's south prepares to secede in about a month.

Southern Kordofan, an oil-producing state which lies in northern territory, has long been seen as a flashpoint because it is home to thousands of fighters who fought alongside the south against Khartoum during the last civil war.

In statements carried by the state news agency SUNA, Sudan's President Omar Hassan al-Bashir said north Sudan's armed forces were in control of Southern Kordofan on Thursday and were combing it for 'remnants of the rebellion'.

Southern Kordofan is important to the north because it has the most productive oil fields that will remain under Khartoum's control after the split. The south could take as much as 75 percent of Sudan's 500,000 barrels per day of oil output.

It also borders the disputed Abyei territory and Darfur, a western region that is the scene of a separate insurgency.

Analysts have predicted fighting could break out in Southern Kordofan ahead of the split, especially after an official of the ruling northern party was named the winner in a gubernatorial election last month.

The south said the vote was rigged, which Khartoum denied.-Reuters