Some 3.6 million people in South Sudan face severe food shortages - the highest levels ever experienced at harvest time - and the crisis is likely to worsen when food from the current harvest runs out next year, the World Food Programme (WFP) said. The country's hunger levels have doubled since last year, the U.N. agency said in a report released on Friday. Nearly 60 percent of the population of Northern Bahr el Ghazal state is affected, 56 percent in Unity, and 47 percent in Western Bahr el Ghazal.