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Economic and Techno-logical Crime Suppression Division commander Major General Wisut Wanitchabutr said one of the vehicles had been partly assembled here. The others were allegedly smuggled in fully assembled.

He did not identify the owners or their family relationships.

The four cars were seized at a carpark by a miniature race circuit near the Seacon Square shopping area in Bangkok's Suan Luang district.

If the owners were unable to produce import documents they each faced a maximum of five years in jail and/or a fine equal to four times the estimated price of the cars, including import taxes - about Bt10 million.

The vehicles would be confiscated and handed to the Customs Department for sale at auction.

The owners have three days to produce documents for the vehicles.

The four cars are a white Silvia S15, a red Mazda RX-7, a Blue Nissan 300 ZX and a gold Nissan SX. None of the four has a registration plate.