Khartoum -

A tribal clash has claimed many casualties near the tense undemarcated border between Sudan and South Sudan, a source familiar with the incident said on Tuesday.

The violence occurred between nomadic Arab Misseriya cattle herders and members of the South Sudanese-based Nuer tribe west of the disputed Abyei region, said the source, an Abyei resident.

“There are many casualties,” he said, unable to give specific details.

The Sudanese Media Centre, which is close to the security apparatus, quoted a Misseriya leader as saying 23 people were killed in a clash with the South Sudanese military on Sunday.

“No, it is a tribal clash,” during the Misseriya's annual migration southwards, the Abyei source said. “It happens every year when they cross the territory of another tribe.”

However, the incident coincides with warnings of rising tension between Sudan and South Sudan along the frontier. - Sapa-AFP