A lone gunman killed three Muslim leaders and seriously injured a fourth when he sprayed their vehicle with assault rifle fire in strife-torn southern Thailand, police said Friday. The four sub-district headmen from Mai Kaen district in Pattani province were driving toward Pattani town about 10 p.m. (1500 GMT) when a man opened fire on them with a M-16 assault rifle from the roadside, Police Maj. Hantee Koraharee said. "Three men died in the car and one was wounded. Police found more than 50 M-16 assault rifle shells," Hantee said of the late Thursday attack. Police identified the dead as Warezawmae Mazaw, 44, Zuemare Todeng, 51, and Hama Salae, 49, Hantee said. Meulee Suding, 58, was hospitalized with serious gunshot wounds. Police were investigating the shooting, he said.