Seventy percent of South Sudans children are out of school and the young country risks losing a generation that would make it harder to rebuild after conflict ends, a United Nations official said. South Sudan, which split off from its northern neighbor Sudan in 2011, has been gripped by a four-year civil war sparked by political rivalry between incumbent leader Salva Kiir and his former deputy Riek Machar. In an interview with Reuters on Friday, Henrietta H. Fore, UNICEFs executive director, made the warning after visiting some of the areas most devastated by the war. "70 percent of the children are out of school, that is highest in the world. There is too much violence," she said. “If we don’t help... we are going to lose this generation and that would be tragic for South Sudan because a country cannot build itself without this next generation of young people." Fore said she had visited towns in the countrys north and witnessed widespread malnutrition among children and warned: "We are heading into the dry season... we might lose up to a quarter of a million children in South Sudan." Tens of thousands are estimated to have died in the conflict which has also displaced a quarter of the countrys population of 12 million. The economy, almost entirely dependent on oil exports, has been left in tatters as output has been cut. Agricultural production, too, has declined as insecurity has left sometimes entire villages abandoned and crops untended. A ceasefire deal was signed in Ethiopias capital Addis Ababa last month but it has been violated repeatedly with both sides blaming each other. Meanwhile, the South Sudan government warned that it would use force if members of a youth militia in the Great Lakes region resist a disarmament process. Last month, the death toll from inter-clan fighting in the region left at least 170 people dead. Defense Minister Kuol Manyang Juuk warned that those resisting disarmament would be seen as challenging the authorities. Stressing that the army rejects to confront any side, he said the military seeks to instill stability in the country.