Officials from the Krabi Harbour Office on Monday joined with forensic police and related officials to inspect the scene where the Sunday explosion of a speedboat injured 16 tourists and boat staff heading from Phuket to Koh Phi Phi.
In seeking the cause of the explosion and fire, officials will interview those involved.
They were waiting to talk to boat driver Kriengkrai Boonsri, 28, who on Monday was being treated in a Krabi hospital's intensive care unit.
Minister of Tourism and Sports Weerasak Kowsurat on Sunday afternoon visited the injured tourists, identified as Xu Xin (female) and Wu Zhian (male), at Krabi Nakharin International Hospital and instructed officials to take care of the wounded and provide aid as appropriate.
Meanwhile, officials from the Trang Harbour Office, Had Chao Mai National Park and marine police checked boats at piers on the popular Koh Kradan to ensure passengers wore safety gears.