SEPARATIST militants shot and killed two Muslim civilians in Thailand's restive south, where an insurgency has been raging for the last five years, police said Wednesday. The men, one of whom was a defence volunteer, were caught in an ambush as they rode their motorcycles from a forest in troubled Narathiwat province late Tuesday, said police. In a separate incident, rescue workers on Tuesday recovered the bodies of a marine sergeant and a Thai Buddhist village defence volunteer after their patrol boat capsized in neighbouring Yala province, they said.