Two assailants on a motorcycle hurled a grenade at a tea shop in Pattani's Khok Pho district on Wednesday afternoon. One villager was wounded in the explosion.
Pol Lt-Col Chamlong Suwanlak, the Na Pradu police station chief, said the attack occurred about 1pm.
Sakchai Kulnarong, 35, resident of tambon Sateng in Muang district, sustained several shrapnel wounds to his body.