Thousands of families in desperate need of food and water have trekked for days from Somalia to the Dadaab refugee camp in eastern Kenya. The drought is the worst in East Africa for 60 years. The UN described it as a "humanitarian emergency"..The already overcrowded complex received 1,000 new refugees a day in June, five times more than a year ago. About 30,000 people arrived at the Dadaab refugee camp in northern Kenya in June, according to UNHCR, the UN's refugee agency, compared to 6,000 in June 2010...Dadaab, a complex of three settlements, is the world's largest refugee camp. Built to house 90,000 people and home to more than four times that number, it was already well over its maximum capacity before this latest influx..Kenya's government approved the construction of the new Ifo II camp two years ago but has since blocked access for fear that refugees will settle there permanently. The UN's refugee agency UNHCR has for two years been calling on the Kenyan government to open the new facilities. Dadaab Refugee Camp, Northern Kenya. July 2011. Photo Robin Hammond/Panos.