Fighting has broken out on the border between Sudan and South Sudan, shortly after the South pulled out of a disputed border town.

南苏丹从苏丹某座边境城市撤军后不久，双方在边境又爆发战乱。

South Sudanese military officials say they repulsed¹ ground and air attacks.

Sudan confirmed there had been clashes, which come after 10 days of fighting over the oilfield town of Heglig.

Satellite pictures of the Heglig area released on Sunday suggest key oil installations were badly damaged in the fighting and are no longer operating.

The pictures were analysed by the US-funded Satellite Sentinel Project (SSP), which says it is impossible to know who was responsible for the damage.

Sudan and South Sudan have accused each other of attacking oil facilities. On Friday South Sudan said it was withdrawing from Heglig, while Sudan said it forced out the South's troops.

Access to the disputed border region around Heglig is limited, making it difficult to verify what is happening in the area.

The renewed fighting has been taking place to the south of the Heglig oilfields, although it is unclear which side of the disputed border it is happening.

Sudan military officials said its forces had repulsed a major rebel attack.

The BBC's James Copnall who is in the border town of Bentiu says the fighting makes it clear that tension has not eased, and also underlines that all-out war is still a possibility.

He says South Sudan is building up its troops near the border, and is assuming that Sudan is doing the same.