Officers are appealing for witnesses following a vandalism at Banchory Primary School, Arbeadie Road, Banchory.
A total of eight windows were smashed between 8am on Saturday, 10 February, and 8am on Sunday, 11 February.
The damage is estimated to be around a low four-figure sum of money.
PC Cameron Donald said: "This mindless vandalism will not only be costly to repair but will impact on the community. It is completely unacceptable and we are urging anyone with information or who saw anything unusual or suspicious over the weekend to get in touch with us on 101 using reference number CF0034210218."
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Police Scotland's North East Division covers rural and urban areas in Moray, Aberdeenshire and Aberdeen City. The division has five territorial command areas which have their own dedicated Area Commander, who is responsible for the daily policing function. Each command area is served by a number of community policing teams whose activities are built around the needs of the local community. These teams respond to local calls and look for long term solutions to key issues. They are assisted by the division's Crime Reduction Unit who deliver against Force and local priorities in a number of areas, including physical and social crime prevention, supporting and enhancing community engagement and creating and sustaining strong and effective partnership working.