Shelling erupted on Friday near the Sudanese town of Agok at the southern tip of the Abyei region which is disputed by northern and southern authorities, and aid workers were being evacuated from the town, a humanitarian official said.
"This morning, from about 10 am, there was shelling on both sides of the river. Later there was shelling just a little bit north of Agok ... All humanitarians are being pulled out of Agok," the official, who asked not to be named, told Reuters.
A spokesman for the northern military was not immediately available to comment. The southern army's spokesman said northern and southern forces clashed in the area on Friday, but said he did not have details yet.