The killings came a week after 85 Muslims were killed when a protest turned violent, many of them suffocated while in police custody.
Islamic leaders warned that the tragedy could trigger reprisal attacks in Thailand’s mainly Muslim south.
Two state railway workers were shot dead early on Thursday in Narathiwat province, according to police.
In Yala province, a senior policeman was also killed on Thursday, by gunmen on a motorbike.
