
Kamol Thumwong and Kurt Werner Kinne, a German man, were detained on Monday at the Paragon shopping mall in Bangkok when they handed over six fake passports to undercover immigration agents.
The Norwegian and French passport copies were sold for Bt78,000.
Immigration Police chief Lt General Chatchawal Suksomjit expressed concern over the wide availability of fake passports in Thailand, saying this business had been secretly going on all along but was now openly advertised on the Internet.
A high-profile passport forger - Bangladeshi man Mohammad Ali Hussein - was earlier arrested in Chaiyaphum by agents from Immigration Police and the Department of Special Investigation.
The suspect, alias Mohammad Amir Hussein, has been wanted by international police for his high-quality work over the years.
Immigration Police also nabbed Ghanian James Tomson for using a fake passport and overstaying his visa.
Officers found ice, an illicit drug, on the man when he was arrested on Sri Nakharin Soi 29 in Suan Luang district.