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At least 50 people have died in clashes between south Sudan's army and Darfuri Arab tribes along the country's north-south divide, reports say.It is the most serious violence reported since the results from Sudan's 11-15 April elections.
They were the first multi-party polls in 24 years, but have been marred by irregularities and alleged fraud, and results have been delayed by days.
The violence will likely raise tensions between north and south, analysts say.
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