U.N. High Commissioner for Refugees Antonio Guterres walks at the Dagahaley camp, near the Kenya-Somalia border July 10, 2011. More than 360,000 people fleeing civil unrest, drought and hunger are estimated to be living at Dadaab, the biggest refugee camp in the world, which was originally built for a capacity of 90,000 people but now has 380,000 refugees near the Kenya-Somali border. REUTERS/Noor Khamis (KENYA - Tags: CIVIL UNREST SOCIETY)