The fire took place at Charity Farmhouse in Goredike Bank, Gorefield, Wisbech, yesterday (Sunday) between midday and 10pm.
PC Matt Smart said: "It is clear this was a deliberate ignition as the electrics had been disconnected by the owner, therefore an accidental electrical fire has been ruled out by the fire service.
"Fortunately no one was hurt but under different circumstances it could have been fatal.”
Anyone with information should contact PC Smart on 101 or Crimestoppers, anonymously, on 0800 555 111.
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