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Police are appealing for information after a group of boys and girls were seen dropping items from a wall at Kearsney Abbey onto passing vehicles.
The incident happened on Friday evening and at around 7.40pm they threw an object which caused a chipped windscreen.
Police believe there were three or four boys and two girls in the group.
Anyone who saw the youths, or who has any information which might identify them, is asked to contact the police on 01304 240055 or Crimestoppers on 0800 555 111.