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CAIRO — An intense flare-up of tribal clashes in southern Sudan over the past three months has killed about 900 people and could threaten upcoming elections crucial to preserving the peace deal that ended civil war with the north, aid workers and U.N. officials said. If violence keeps up at the rate of the past few months, the fighting over cattle and territory is on pace to claim more lives this year than Sudan’s separate ongoing conflict in the western region of Darfur.



