Twenty-five people have been killed and several more wounded in clashes in the tense oil-rich Upper Nile region of south Sudan, a military spokesman said on Saturday. Heavily armed fighters attacked an ethnic Dinka settlement in Bony-Thiang, north of the state capital Malakal, early on Friday, Major General Kuol Diem Kuol, of the southern Sudan People's Liberation Army (SPLA), said. "They killed 20, including the paramount chief, his two wives and three children, and wounded many more," Kuol said. "They have burnt down the village and destroyed all the huts, and they have stolen very many cattle." Angry Dinka groups then launched a retaliatory raid on the nearby Shilluk village of Bon, killing five people including a woman and two children, Kuol said.