by Helen Wagstaff

A police watchdog is investigating the death of a woman after a crash involving an unmarked police car on the A21.

The accident happened on the Pembury Road, between the Fairthorne Garage and North Farm roundabout at around 12.35pm Tuesday. It has been referred to the .

The collision involved two cars, one of which belonged to the Metropolitan Police, and was driven by an off-duty officer.

The driver of the other vehicle - a local woman - died at the scene, while a passenger in the same vehicle was airlifted to hospital with injuries not thought to be life-threatening.

The coroner's office has been advised and the woman's family informed. No further details about the dead woman have yet been released.

The A21 between the A2014 Pembury Road junction and the Longfield Road junction in Tunbridge Wells was closed for several hours while emergency services dealt with the incident.

• Anyone with information is urged to contact Kent Police's on 01622 798538.