Among the victims was well-known restaurateur Salvatore Cossu, 65. An iron bar was used to smash a window on his Toyota Fortuna parked in Phang Nga Road last night.
''My passport and work permit were inside but fortunately these were not taken,'' he told police.
Another vehicle nearby was also broken into in similar fashion, with the owner losing four credit cards. A third car also suffered a smashed window.
The break-ins took place near the Kasikorn Bank.
''We believe more than one person is involved so people should be careful and park in the brighter-lit parts on Phuket City,'' said an officer from Phuket City Police Station.