In this photo released by the World Food Programme (WFP), WFP staff and helpers unload a truck of cereal food assistance at a U.N. compound where many displaced have taken shelter in Juba, South Sudan, Tuesday, Dec. 24, 2013. South Sudan's military spokesman says there is increasing tension at a United Nations camp in the rebel-held city of Bor because armed elements have entered the congested area where the U.N. says about 17,000 civilians are seeking protection. (AP Photo/WFP, George Fominyen) / World Food Programme
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