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People unload aid from an helicotper provided by the UN Mission in South Sudan for the World Food Program in Pibor, South Sudan's Jonglei state, on January 12, 2012. The World Food Programme said on January 13 it wanted to send more helicopters to deliver supplies because of limited road access. The UN says that it has registered over 2,000 people that have fled here from a wave of tribal violence between the Murle and Nuer people in recent weeks. An estimated 60,000 people have been affected by recent fighting in the worst outbreak of violence since South Sudan gained independence in July 2011. An 8,000-strong militia army from the Lou Nuer tribe recently marched on Pibor, home to the rival Murle people, whom they blame for abductions and cattle raiding.  AFP PHOTO / HANNAH MCNEISH (Photo credit should read HANNAH MCNEISH/AFP/Getty Images) Hannah McNeish/AFP/Getty