A listed building in Avenham Park has been damaged by vandals.
Avenham Park’s Swiss Chalet has a section boarded up after the incident.
Arsonists struck around 10am on Tuesday 18 July and caused damage to a section of the grade-II listed building.
Preston City Council says it has cordoned off part of the chalet until work can be done, but the building remains open to the public as usual.
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Cabinet member for community and environment councillor Robert Boswell said: “Unfortunately the Swiss Chalet located in Avenham Park was set on fire recently.
“The back of the structure was significantly damaged and it was only the swift actions of the Lancashire Fire and Rescue Service which prevented further destruction.
“The Swiss Chalet is a listed structure and a specialist type of repair is required. In the meantime it can still be enjoyed by the public.”
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Anyone with information about the incident is asked to call Preston Police on 101 quoting reference LC-20170724-1281.