Stunned shoppers watched as a yob jumped up and down on the roof of a police car parked outside a Kent supermarket.

The incident was caught on film by an onlooker yesterday morning in the car park of Sainsbury's in Dartford.

The vandal is heard to ask others for a "a stick or a bar or something" and then climbs onto the roof of car and repeatedly jumps up and down, ignoring a friend's pleas to stop.

He then breaks the rear windscreen of the car, swinging what appears to be a shovel at the vehicle and setting off an alarm, before removing items from the back of the car.

A police spokesman said: "Kent Police was called at just after 9.35am to a report of damage to a police vehicle in a supermarket car park in Priory Market Place, Dartford.

"The police car was empty at the time. A 44-year-old man was arrested on suspicion of criminal damage."