A Thai soldier killed many people on Saturday in a live streamed mass shooting across several locations in a northeastern city of Nakhon Ratchasima, popularly known as Korat.
"The gunman used a machine gun and shot innocent victims resulting in many injured and dead," a police spokesperson said, with local media reporting as many as 12 fatalities.
A police officer contacted by phone said the soldier had a quarrel about a land deal and shot two people who were involved, another soldier and a woman.
The police officer, who asked not to be identified because he was not authorised to release information, said the man took a gun from the base where he is stationed outside the city and drove to the mall, shooting along the way.
Royal Thai Police spokesman Krissana Pattanacharoen said more than 10 people had been killed.
The gunman, identified by police as Sergeant Major Jakapanth Thomma, also posted photos and video of himself in full tactical gear as the attack was carried out.
Video and photos circulating online showed panicked scenes, with people fleeing and what appeared to be the sound of automatic gunfire filling the air.
Police in the province said they have sealed off a Terminal 21 shopping mall but have yet to capture the gunman.
Thailand has one of the highest rates of gun ownership in the world but mass shootings by soldiers targeting civilians are rare. (AFP, AP)