United Nations, Rajab 21, 1435, May 20, 2014, SPA -- More than one-third of South Sudan's population, or 4 million people, will be "on the edge of starvation" by the end of the year as fighting continues in the world's newest country, U.N. officials warned Tuesday. Battles between government forces and rebels have destroyed food markets and forced people to abandon their livestock and land, the aid experts said. "We are losing time. Farmers should be planting their crops right now," Valerie Amos, the top U.N. humanitarian official, told a donors' conference in Oslo, Norway. "f they don't, and if livestock herders are not able to migrate to grazing areas, people will run out of food." --SPA 18:12 LOCAL TIME 15:12 GMT www.spa.gov.sa/w