Iran Press/Asia: The shooting happened in Thailand's Nakhon Ratchasima Province on Saturday.
Krissana Pattanacharoen, a police spokesman, told CNN: "At the moment we are trying to arrest the guy. Both police and military forces have been deployed to the area."
Pattanacharoen said the motive of the gunman, who is believed to be a soldier in the 2nd Army Regional Command, remains unknown.
The military commander, Lt. General Thanya Kiatsarn, who is at the scene of the shooting said: "We can't confirm if there are any hostages taken. But we believe he [the shooter] is still holding inside Terminal 21 shopping mall. We are working on this."
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5 shot dead in home invasion in southern Thailand