Police have found more cannabis plants at a former Debenhams store in Derbyshire today (Monday, January 18).
Officers searching a different part of the building on Victoria Street in Derby this morning discovered around 1,000 plants.
This is in addition to the plants found on Thursday, January 14, thought to total around 2,000.
Police have been working closely with the owners of the building to discover how the set-up was established and who was involved.
Anyone with information should call police on 101, quoting incident number 420/14/01/16, or Crimestoppers anonymously on 0800 555 111.