Around 60 windows were smashed at a school in east Belfast.
Graffiti was also sprayed at the premises at Avoniel Road on Saturday night (May 14).
Police received a report just after 11pm that three people had entered the grounds and began smashing windows.
Inspector Lowry said approximately 60 windows were broken inside the building as well as numerous graffiti marks sprayed around the premises.
“Our investigation is now underway and we are appealing to anyone who may have any information or dashcam footage which can assist us to contact 101 quoting reference number 2144 14/05/22,” he said.
Alternatively, information can be provided to the independent charity Crimestoppers on 0800 555 111, which is 100% anonymous and gives people the power to speak up and stop crime.