The agency is urging the public to keep a look out and to alert the authorities if they spot any suspicious cars.
Police said of eight stolen vehicles reported, three had already been fitted with explosive devices and used in last weekend’s car bombings - one in Hat Yai and two in Yala on the same day.
The other five suspicious vehicles, all pickups, are a white Toyota Hilux, a green Mitsubishi L200, and three Isuzus, one brown, one bronze and one Isuzu Gold.
The move comes after the double bomb attacks in Songkhla and Yala last weekend, which killed a total of 14 and injured many others.