Thieves put a police car out of action by shunting it several times using a stolen Land Rover.
The cop car was so badly damaged that officers were unable to continue chasing the crooks who had tried to force their way into a Tring business.
They had used the green 4x4 to ram the building causing thousands of pounds worth of damage but failed to get inside before police arrived at around 11.45pm on Monday. The Land Rover was discovered in Cheddington Lane, Long Marston, today (Tuesday). No-one has yet been arrested.
Anyone with information can call police on the non-emergency number 101.