A DRUGS factory was discovered by police at a house in Cowley Road, Oxford.
Officers raided the house yesterday after a tip-off from a caretaker who had become suspicious and found about 350 plant pots used for growing cannabis.
But the plants had recently been harvested and no cannabis leaves were seized.
No one has been arrested.
PC Leigh Thompson, drugs co-ordinator for Oxfordshire, said: "Although it is disappointing some of the cannabis may have hit the streets, we have seriously disrupted this operation.
"The caretaker did exactly what we expect landlords to do, and that's keep a close eye on their properties and report to the police anything they think is suspicious.
"With thousands of pounds damage being caused to some properties turned over to cultivating cannabis, it's in landlords' interests to do so."
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