Two Chinese tourists were arrested by tourist police at Suvarnabhumi international airport and charged with the assault of one of their countrymen.
Both were fined a maximum of 50,000 baht each, and their records were sent to the Immigration Bureau for black- listing consideration.
The arrest came after a video clip was posted on social media showing the two tourists were assaulting a Chinese illegal tour guide at a duty free shop in Bang Plee, Samut Prakarn.
The poster said it was a brawl between the Chinese illegal tour guides.
The video clip drew strong criticism of the illegal tour business operated by the Chinese guides.
The clip prompted tourist police to investigate and track down the guides for legal action.
Upon arrest by police both admitted to be the men in the brawl.
They recalled that they had been in conflict with their Chinese business partner before in China.
They said that on Sunday night when they visited a duty-free shop at Bang Plee, they accidentally came across their business foe and were insulted by him.
As they were drunk at the time, they then assaulted him, tourist police said.
Meanwhile the Samut Prakarn police commander said police imposed the maximum fine of 50,000 baht on each for assault, and creating public nuisance.
Their records were also sent to the Immigration Bureau for blacklist consideration.
The police chief also warned the poster of the clip that the posting might violate the Computer Crime Act as what was said in the clip was false.
The two Chinese men are not guides and the tour company that brought them here is a legal tour company, he added