Police raided an abandoned former Boots store - only to discover hundreds of cannabis plants inside. They burst into the building in Burslem, Stoke-on-Trent, on July 4.
Staffordshire Police are now trying to find the gardeners and brains behind the mass operation, Stoke-on-Trent Live reports.
A police spokesman said: "We are investigating after approximately 500 cannabis plants were discovered inside a business property. Police forced entry into the building and once inside discovered a large-scale cannabis cultivation spanning several rooms and two floors.
"Western Power was called to attend due to an electricity bypass at the site.
"Police are currently working to establish the offenders responsible for the grow and would like to speak to anyone with any information."
Witnesses should call the police on 101, quoting incident number 229 of July 4, or alternatively call Crimestoppers, anonymously, on 0800 555111.
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