Police found more than 600 cannabis plants in Leeds.
Officers from Leeds District Serious Organised Crime Unit executed a drugs warrant at a house in Woodlea Drive, Meanwood, shortly after 6am on Wednesday last week.
A West Yorkshire Police spokesman said: "A total of 673 plants were found being grown in four rooms of the house.
"They were recovered from the property along with a number of high-powered lights and other growing equipment.
"No-one was present at the address and enquiries are ongoing to identify those responsible."