Officers were called at about 3.45am on Wednesday (21st May) )by someone who had heard loud noises and seen two men loitering suspiciously.
Officers and a police dog attended and carried out a search. Although there was no trace of the men, the officers found a nearby property had a smashed window.
No one was inside but they found some 400 suspected cannabis plants being grown in bedrooms and the attic.
A team from Operation Viscount – the specialist team dedicated to tackling cannabis production across the Avon & Somerset policing area – attended and seized the plants and growing equipment.
Neighbourhood Sergeant Rachael Hodges said: “The member of the public who called us to report this suspicious behaviour did exactly the right thing. We’re always grateful to people who call in with information about possible criminal activity.
“We have seized the plants and crime scene investigators have inspected the property. Our inquiries continue.
“Anyone with any information which could help our investigation is asked to get in touch through the website or by calling 101 quoting reference 50819/14. Alternatively ring the independent charity Crimestoppers on 0800 555 111.”