A Somali refugee mother with her children pose for photos at Dadaab refugee camp in Kenya, May 8, 2015. Dadaab, the world's largest refugee camp in northeastern Kenya, currently houses some 350,000 people. For more than 20 years, it has been home to generations of Somalis who have fled their homeland wracked by conflicts. (Xinhua/Sun Ruibo)

A Somali refugee boy is seen at Dadaab refugee camp in Kenya, May 8, 2015. Dadaab, the world's largest refugee camp in northeastern Kenya, currently houses some 350,000 people. For more than 20 years, it has been home to generations of Somalis who have fled their homeland wracked by conflicts. (Xinhua/Sun Ruibo)

Refugees gather to watch UN High Commissioner for Refugee Antonio Guterres' visiting delegation at Dadaab refugee camp, Kenya, May 8, 2015. Dadaab, the world's largest refugee camp in northeastern Kenya, currently houses some 350,000 people. For more than 20 years, it has been home to generations of Somalis who have fled their homeland wracked by conflicts. (Xinhua/Sun Ruibo)

A refugee mother and her child look outside of a window at a hospital in Dadaab refugee camp, Kenya, May 8, 2015. Dadaab, the world's largest refugee camp in northeastern Kenya, currently houses some 350,000 people. For more than 20 years, it has been home to generations of Somalis who have fled their homeland wracked by conflicts. (Xinhua/Sun Ruibo)

A refugee child smiles with his mother at Dadaab refugee camp, Kenya, May 8, 2015. Dadaab, the world's largest refugee camp in northeastern Kenya, currently houses some 350,000 people. For more than 20 years, it has been home to generations of Somalis who have fled their homeland wracked by conflicts. (Xinhua/Sun Ruibo)

A refugee mother goes past a crowd with her child at Dadaab refugee camp, Kenya, May 8, 2015. Dadaab, the world's largest refugee camp in northeastern Kenya, currently houses some 350,000 people. For more than 20 years, it has been home to generations of Somalis who have fled their homeland wracked by conflicts. (Xinhua/Sun Ruibo)

A refugee mother and her child walk past an armed police at Dadaab refugee camp in Kenya, May 8, 2015. Dadaab, the world's largest refugee camp in northeastern Kenya, currently houses some 350,000 people. For more than 20 years, it has been home to generations of Somalis who have fled their homeland wracked by conflicts. (Xinhua/Sun Ruibo)

Somali refugees listen during a meeting between refugee representatives and members of UNHCR delegation at Dadaab refugee camp, Kenya, May 8, 2015. Dadaab, the world's largest refugee camp in northeastern Kenya, currently houses some 350,000 people. For more than 20 years, it has been home to generations of Somalis who have fled their homeland wracked by conflicts. (Xinhua/Sun Ruibo)