A £100,000 purpose-built play area has been targeted again by vandals.
Firebugs caused significant damage to a wooden climbing frame at the facility, off Great Greens Lane, Clayton Brook.
The facilities were built in 2009 for the urban sport of free-running. It was a joint venture between Chorley Council and social housing company Places for People, funded by the Big Lottery Fund’s Changing Spaces Programme.
The project was the first of its kind in the country.
Firefighters tackled the blaze on Tuesday evening.
The current Mayor of Chorley, Councillor John Walker, who opened the play when he was executive member for people, said: “It’s very disappointing when vandals come round and do all these dreadful acts.”
In August 2013, a fire destroyed 10 square metres of rubber play area and the fibreglass play structure.
Jamie Carson, Chorley Council’s director for people and places, said: “There has been significant damage to the facility. We’ve made the area safe, now we need to review what happened and speak to the community groups, councillors and youngsters in the area again to assess where we go from here, and how we can try and help prevent this from happening again.
“I would urge anyone who may have information to contact the police on 101.”