Former politician and massage parlour tycoon Chuwit Kamolvisit has urged the Justice Ministry to probe major Chinese triad gangs believed to be laundering money through "grey businesses" in the country.

Mr Chuwit on Monday went to the ministry, where he submitted documents related to the alleged financial activities of major triad gangs.

His move follows claims he made on Thursday that the triad gangs' alleged boss named Mr Tuhao, fled the country with the assistance of certain state officials on a jet just hours after police raided a pub linked to him in Bangkok's Yannawa district last month.

Mr Chuwit had requested the DSI investigate the matter and seize the triads' assets.

He has been offered witness protection as the case has received much attention from the public.

Mr Chuwit has expressed concerns over the fact that Mr Tuhao has not had a police arrest warrant issued for him; therefore, he decided to hand what he said was evidence of the triads' financial transactions over to the authorities.