Somyot held a news conference today with national police chief Chakthip Chaijinda to announce that an investigation was underway into the results of a match in July and three matches in September.
Police reported that four players from the Navy team and one from Nakhon Ratchasima were allegedly paid up to 200,000 Thai baht ($6,100) to manipulate results.
The FAT and Royal Thai Police used information from data services company Sportradar as part of the investigation after an unusual number of goals were scored in the late stages of the games.
Chakthip said all 12 were in custody pending a trial. He said match and club officials can face up to 10 years in prison if found guilty of match-fixing, and players could face up to five years in jail.
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