A man lies wounded on the ground next to a pool of blood outside the shopping mall where a gunman killed at least 12 people in Thailand tonight.

The killer - believed to be a soldier - opened fire at the Terminal 21 building in the city of Korat, Nakhon Ratchasima province, shortly before 6 pm.

Horrifying footage from onlookers shows the masks shooter - who is still active - picking people off with a rifle.

At least two police officers have been killed. Many more are believed to be injured after the shooting spree, during the busiest time of the week.

Pictures show the bloodbath with bodies littered across the roads near the shopping centre and slumped in their cars.

A gas tank next to the building also exploded in a ball of flames after the gunman shot it. Police have raced to the scene.

Police believe the killer has 16 hostages inside the shopping mall after killing 12 people outside.

Colonel Kritsana Pattanacharoen said the military knew about the shooter identity and insisted people to stay away from the scene.

Major General Apirat Kongsompong said he had ordered all available police and military units in the area to attend the scene.

A man lies wounded on the ground next to a pool of blood outside the shopping mall where a gunman killed at least 12 people in Thailand tonight.

The killer - believed to be a soldier - opened fire at the Terminal 21 building in the city of Korat, Nakhon Ratchasima province, shortly before 6pm.

Horrifying footage from onlookers shows the masks shooter - who is still ACTIVE - picking people off with a rifle.

At least two police officers have been killed. Many more are believed to be injured after the shooting spree, during the busiest time of the week.

Pictures show the bloodbath with bodies littered across the roads near the shopping centre and slumped in their cars.

A gas tank next to the building also exploded in a ball of flames after the gunamn shot it. Police have raced to the scene.

Police believe the killer has 16 hostages inside the shopping mall after killing 12 people outside.

Colonel Kritsana Pattanacharoen said the military knew about the shooter identity and insisted people to stay away from the scene.

Major General Apirat Kongsompong said he had ordered all available police and military units in the area to attend the scene.