“We want to get information about the crew it hired to stage the fireworks display,” Pol Colonel Sutti Puangpikun, deputy provincial police chief, said yesterday.
The event planner, Comm Art Production Co, is owned by famous director Supawat “Supaksorn” Jongsiri.
The move is part of the police investigation to pin down the cause of the accident.
Sutti said more than 500 people have lodged complaints with police.
The blast and blazes also injured more than 70 people, damaged more than 200 houses and left more than 700 people homeless.
“My whole house is gone,” said Anong Uayporn, 56. Her car and motorcycle were also wrecked.
Somnuk Kamneung, 37, said she was helping with the Suphan Buri City Pillar Shrine Foundation when she heard the deafening detonations.
“When I realised what had happened and rushed to my house, I found it was already on fire,” she said.
Besides all her furniture, Bt50,000 in cash was burnt to ashes.
“I really don’t know what to do with my life after this,” she said.
The City Pillar Shrine and Dragon Park are located in the same compound. They attract hordes of tourists each day.
The lightandsound shows for the Chinese New Year festival at Dragon Park went ahead yesterday without any fireworks show.
Only the Dragon Descendant Museum within the Giant Dragon structure was closed.
Army chief General Prayut Janocha said the Army’s Chemical Department had dispatched a team to assist with efforts to determine what went wrong.