Officers are appealing for information following a silver Renault Megane being found abandoned on the Prince of Wales Bridge, eastbound.
The car was reported to police at 9.28am yesterday, Tuesday 28th January.
Officers and HM Coastguards have been conducting searches and enquiries in the area to locate the driver of the vehicle.
Officers would be keen to speak to anyone who may have witnessed the vehicle being abandoned in the early hours of Monday morning or have any dash cam footage relating to this.
Please contact us on 101 quoting 200033414 or via the Gwent Police Facebook/Twitter pages.