Vandals have caused around £11,000 of damage after climbing on to the roof of an Aberdeen hospital.
The culprits ripped up slates and smashed a window at Woodend Hospital.
Hospital chiefs believe three people carried out the “mindless” attack and have appealed for help to catch the culprits.
The incident on Monday was at the hospital’s industrial complex, which contains a boiler house and a number of storage facilities.
Scott Arnot, support manager of elderly and rehabilitation services at Woodend, said: “Around £11,000 worth of damage has been done to the industrial complex following reports of three people on the roof around 3pm on Monday.
“This matter has been reported to Police Scotland. We would encourage anyone who was in the area at the time and saw anything to get in touch with them via 101.
“This is the third such incident at Woodend Hospital in recent weeks.
“It is deeply disappointing to see this level of damage done to public buildings.”
David Cameron, councillor for Kingswells, Sheddocksley and Summerhill, said: “It’s mindless vandalism, and it’s so antisocial.
“There seems to be a desire for excitement and danger and we need to try and sort it out.”
Investigating officer Pc Eamonn Ryan said: “The incident on Monday afternoon has caused a significant amount of damage to a hospital building and is completely unacceptable.
“Three youths were witnessed in the area at the time and I would be keen to hear from anyone who has any information about this incident or the persons responsible.