Damage was caused to the contents of a number of mobile classrooms, including the windows and toilets at a school in Newtownabbey.
Police are appealing for information following the incident which happened at Old Manse Road on Monday 17th February.
Further damage was also caused to the exterior walls, where spray paint had been used.
Enquiries are ongoing to identify those involved, but if you have any information which could assist officers, please contact us on 101 or online via http://www.psni.police.uk/
If you would prefer to provide information without giving your details, you can contact the independent Crimestoppers charity anonymously on 0800 555 111.