The northern Sudanese Army says it has taken control of Abyei, a contested area on the border with South Sudan.
Sudanese state television, based in Khartoum, said northern troops had "repelled enemy forces" in Abyei town. UN officials confirmed the development.
The move follows three days of clashes between northern and southern forces in the area.
The dispute over the oil-rich region is seen as a possible trigger for a new north-south civil war.
South Sudan is due to become independent in July, but Abyei is still claimed by both sides.
The BBC's James Copnall in Khartoum says the key question is whether the fighting is now over or whether a new civil war is about to begin.
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