As the result of an ongoing operation targeting the cultivation of cannabis plants in the Mayo Division, Gardaí at Claremorris in conjunction with gardaí at Swinford last Friday searched a premises at The Square, Swinford.
The Regional Support Unit assisted in this search.
Up to 1,000 cannabis plants were discovered at various stages of growth in a number of rooms in the premises.
These plants have an estimated street value of approximately €400,000.
The premises had been renovated into a sophisticated cannabis growing factory and extensive lighting and ventilation systems had been installed.
A large amount of cultivation equipment was also found on the premises.
No arrests have been made and investigations are continuing.
