AT least 81 people have been killed in the South Sudan region of Warrap State following heavy fighting between armed civilians and government forces carrying out a disarmament exercise, the military's spokesman said on Tuesday. Lul Ruai Koang told Reuters the two-day clashes erupted over the weekend after some armed youths in the Greater Tonj area started engaging the security forces. It was not immediately clear what sparked the fight, he said, adding that an investigation has been started. "Among the dead are 55 members of the security forces and 26 civilians. Another 31 servicemen were also wounded," Koang said,…