A police hunt is under way after vandals targeted Ellon Academy.
Its emerged that a building and outdoor classroom area were damaged in the attack, which happened sometime between Sunday afternoon and Monday morning.
The cost of the damage is estimated at a mid-three figure sum.
Head teacher Tim McKay said: “This appears to be a mindless act of vandalism which has resulted in some minor disruption to our pupils’ learning.
“As a result of the break in, the external and internal doors and some carpet of the classroom will have to be replaced. No theft appears to have taken place and we hope to have the classroom returned to use next week.
“In the six years I have been at the school, this is the first time such an incident has taken place.
“We are all really disappointed that such a thing has happened in our community.”
The attack was also strongly criticised by Ellon and District councillor Richard Thomson.
He told the Times: “I condemn any act of vandalism, but there’s something particularly pointless about vandalising public property given that we all have to pay for it in the end.
“This is disruption which I’m sure teachers and pupils could well do without in the exam period.
“I hope that anyone with any information on who might be responsible will take it to the police as quickly as possible.”
Police have issued an appeal for witnesses to the incident.
The vandals struck between 1pm on Sunday, May 26, and 6.30am on Monday, May 27.
Anyone with information is asked to contact Police Scotland on 101, or anonymously via Crimestoppers on 0800 555 111.
Meanwhile, police inquiries are continuing into recent vandalism at a woodland project at Balmedie School.