http://www.bbc.co.uk/news/world-africa-11510109
A crowd of several thousand northerners demonstrating in favour of unity turned on around 40 southerners who arrived at the rally. The police then joined in, beating southerners who fled the scene, witnesses said.
Salva Kiir earlier asked the UN delegation to deploy peacekeepers along the border with the north ahead of the referendum.
Between eight and 10 areas along the border, including the Abyei oil fields, are still in dispute and analysts say a clash at any of them could spark off a military confrontation. Both sides have sent troops there.
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