Three teenage boys damaged a car while the owner was sat in it in a car park in Wellingborough.
The incident took place in the Post Office car park, Northampton Road, at some point between 4.30pm and 4.50pm on Thursday, March 17.
A red Mini Clubman car was damaged when a group of three teenage boys ran past it, and one of them used an instrument to cause damage to the front passenger door with the owner inside.
One of the teenage boys was riding a bicycle.
Anyone with information can contact police on 101 or Crimestoppers anonymously on 0800 555111.