Graffiti discovered on Brougham Castle (Image: Google Maps)
Police are investigating after graffiti was found on Brougham Castle, near Penrith.
It is believed to have happened on February 24.
A spokesperson from Cumbria Police said: "It will need specialist treatment to remove the graffiti due to the age of the stonework.
"Officers are appealing for information.
"You can report online at www.cumbria.police.uk/report-it - You can also phone on 101.
"Alternatively, you can contact Crimestoppers anonymously on 0800 555 111."
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