Rebel soldiers with the Sudanese Liberation Army (SLA) keep guard at a camp for displaced people near El-Fasher, capital of the north Darfur region, March 25, 2007. Five Darfur rebel groups agreed on Saturday to unite ahead of possible peace talks to end a four-year conflict in the region which so far has defied resolution, in part because of fractious rebel groups. REUTERS/Michael Kamber
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