Vandals break windows at Astley Hall in Chorley
Vandals have broken more than 20 panes of glass at a historic country house in Lancashire.
The damage to Astley Hall in Chorley, put at thousands of pounds, happened at 2000 BST on Tuesday.
Windows in the Long Gallery, War Memorial Room and Townley Parker Room were broken, as witnessed by several people using Astley Park.
Some of the panes of glass are original to the building, built in the 15th Century.
Both the council and police are appealing for people to come forward with information.
Councillor John Walker, who is responsible for parks and open spaces in Chorley, said: "This is just mindless vandalism and I would urge anyone who saw what happened to contact us.
"It appears that a group of teenagers were picking up stones from around the Hall and throwing them at the windows.
"We are currently reviewing the CCTV footage and hope to be able to identify who was responsible."
Lancashire Police are investigating the incident.