A Citroen Saxo was badly damaged when it collided with the back of a Vauxhall Astra police car in Bolton Road, Blackburn.
The incident happened around 3.50pm yesterday, close to the old Blackburn Royal Infirmary site.
The cars were heading away from the town centre at the time of the smash.
No-one was injured in the collision, and the cause of the accident is being investigated.
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