The explosion occurred on Ruenrom Rd in tambon Thap Thieng of Muang district, about 200 metres from the house of the provincial police chief and near the city hall, government office complex and office of the provincial election committee.
The bomb went off at about 3pm while vendors were preparing their goods for sale at a market on Ruenrom Rd.
After the blast, about 50 policemen were deployed to seal off the area to facilitate police investigation.
The bomb was believed to be well-planned as witnesses earlier saw a man bring a suspicious object to the area.
Investigation was still underway.
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