A new woodland playground in Rathfarnham was vandalised and burnt down last week.
The playground is located in Rathfarnham Castle Park and was in the middle of being installed.
Work began on the project in March and was expected to cost €50,000 before the vandalism took place.
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A tree was also damaged during the fire.
Local Rathfarnham Councillor David McManus said those responsible are a "thundering disgrace".
He said: "I am beyond furious that part of our new woodland playground was burnt in a deliberate fire on Friday night. These thugs have vandalised public property and are a thundering disgrace.
"This new €50,000 playground was being installed following representations that I and local residents had made to South Dublin County Council, with works having started recently in March. More public money will need to be spent for new playground equipment.
"I am appealing to local residents - if you saw anything suspicious last Friday night around Rathfarnham Castle Park, please contact Rathfarnham Garda Station on 01 666 6082."
A garda spokesman told Dublin Live: "Gardaí are investigating an incident of criminal damage in a woodland area of Scholarstown, Dublin 16. The incident is understood to have occurred over the weekend between 9 and 11 April 2022.
"Damage was caused by fire to timber and a tree in the area. Investigations are continuing."
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