Residents are being urged to remain vigilant after lead and copper were stolen from buildings in Castleford.
In a post on Facebook, West Yorkshire Police said there had been a number of reports of lead and copper being stolen from roofs of buildings.
The thefts occurred in the Smawthorne area of Castleford.
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The Castleford Neighbourhood Policing Team said they would be conducting proactive patrols in the area and watching for reports online, but urged those affected to report the crime.
A spokesperson for West Yorkshire Police said: "If you notice anybody, or any vehicles, acting suspiciously in the area don’t hesitate to call 101, or use the Online 101 facility on our website.
"If you witness a crime ongoing, please call 999 immediately."
"Alternatively, you can report instances of crime through CrimeStoppers on 0800 555 111."