Police warned motorists to always drive with their doors locked after a man on a motorbike was filmed opening the driverís door of a moving car.
The video, shot on York Street, St Georgeís, also showed the man moments earlier attempt to open the door of another car, but pulling away when he found it locked. The biker managed to get the door of the second car open, but rode away.
The incidents, which happened on Sunday about 7.30pm, were recorded and distributed on social media.
A police spokesman said an investigation into the incidents had been launched and appealed for the drivers of the cars and whoever made the recording to come forward.
He added that anyone who had a similar experience should contact police on their main number or use the 911 number in an emergency.