A World Food Programme (WFP) truck backs up to load food items from a recently landed UN helicopter, in Yida camp, South Sudan Friday, Sept. 14, 2012. Roads have become impassable due to rains, forcing humanitarian agencies to bring supplies in by air to Yida refugee camp which is home to thousands of people who have fled recent fighting in Sudan's Southern Kordofan state and around the border of Sudan and South Sudan. (AP Photo/Mackenzie Knowles-Coursin)