Rural home owners are being encouraged to take measures to warn off oil thieves.
A survey collected by the National Farmers Union found that fuel is the third most attractive commodity for thieves targeting rural homes.
Increasing energy prices and colder weather makes heating oil even more prone to theft.
Chief Superintendent Tim De Meyer of Thames Valley Police, said: "We recommend taking simple precautions to protect your tank as doing so will considerably reduce your risk of becoming a victim of crime."
He suggested rural dwellers consider fitting lockable caps and fuel gauge alarms to oil tanks, install security lights or CCTV and look out for suspicious vehicles.
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