A cannabis grow with over 200 plants has been discovered in Broadgate.
Preston Police officers found the grow, which spanned across five rooms, thanks to information from the community.
Evidence was also found that the electricity had been bypassed.
No arrests have been made and enquiries are ongoing.
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Inspector Dave Byrne from Preston’s Local Policing Team said: “The cultivation of cannabis causes misery for local communities and often funds serious and organised crime.
“Tampering with electricity supplies to power these cannabis farms is really dangerous. It can have lethal consequences for those living in neighbouring properties.
“We’re determined to continue to crack down on those involved in cannabis cultivation and would urge anyone who notices anything suspicious, like screened-off windows, unusual amounts of heat coming from a property and strange smells or sounds to get in touch with us.”
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