Police say suspected Muslim insurgents have killed three people and injured five others in several attacks in Thailand's violence-plagued south. More than 4,700 people have been killed in the country's Muslim-dominated southern provinces since an Islamist insurgency flared in 2004. Police say assailants fatally shot a 38-year-old teacher on Tuesday and then set his body on fire on a highway in Yala province. They say two Corrections Department officials were also killed while inspecting the construction site of a prison in Narathiwat province. In a third incident, five people were wounded in a drive-by shooting in front of a teahouse in Narathiwat. They included a Malaysian man and a 9-year-old boy.