A cannabis farm was discovered by police during a raid in Cleckheaton this morning.
Police said drugs were removed from a house on Prospect Villas after officers forced entry at around 10.30am.
The house was empty and police are trying to trace the occupants.
A West Yorkshire Police spokesman said: “Officers from the Batley and Spen Safer Neighbourhood’s Policing Team executed a warrant today under the Misuse of Drugs Act at an address in Cleckheaton.
“At the address, a sophisticated cannabis farm was discovered, and a large amount of drugs were seized.
“A forensic examination of the property was carried out, and enquiries are ongoing to trace the occupants. Officers acted upon information supplied via Crimestoppers.”
Any one who suspects cannabis being grown can contact Crimestoppers anonymously on 0800 555111 or police on 101