Cannabis plants with a street value of more than £780,000 have been found in two industrial units in Thornbury.
Police were alerted after a tip-off over the weekend. They found 786 cannabis plants - each worth around £1,000.
Its the second major seizure of cannabis from an industrial unit in the Bristol area in recent weeks. Last month more than 1,000 plants were found at a unit in Kingswood.
The latest discovery was made on Sunday. When officers went to investigate they smelt what they believed to be cannabis and heard a low humming noise from one of the units. A closer inspection found a door slightly open which revealed the cannabis plants.
Further searches identified a second unit with more plants. No arrests have yet been made.
This is another important find and we are committed to identifying those responsible for cultivating this significant amount of cannabis.
In an effort to raise public awareness Avon and Somerset Police has issued a list of signs that may indicate a property is being used to cultivate cannabis.
A strong vegetable smell
Windows covered from the inside with plastic or polythene
Condensation on windows
Curtains always drawn
House appears unoccupied