Suspected Muslim insurgents shot dead four people aboard a train as it travelled through southern Thailand, police said on Sunday.
Ten gunmen entered the driver's cabin as the train approached a station in Yala province on Saturday night, then shot and killed three civilian employees and a policeman, said police Lt. Noraset Suksri.
The attackers fled when the train stopped after the shooting, the police officer said.
Yala is one of three southernmost provinces beset by a separatist insurgency in which more than 3,000 people have been killed since early 2004.
Muslims in the three provinces of Yala, Pattani and Narathiwat, the majority in Buddhist Thailand's far south, accuse the central government of discrimination, especially in jobs and education.