POLICE uncovered a cannabis farm with more than 500 plants in a house in Sunderland.
Officers found the drugs when they raided a house at Otto Terrace, in Thornhill.
Inside, they discovered a room packed with the plants, which are believed to have a street value of more than £150,000.
Nearby Mount Road, in Barnes, was also raided and officers seized about £14,000 in cash.
Nine people, in their 20s and 30s, have been arrested on suspicion of being involved in a conspiracy to produce industrial amounts of cannabis. They were being quizzed by police.
Residents living in Otto Terrace said the raid did not come as a surprise.
Student Karon Stones, 20, said: “You never really saw anyone coming in or out of the house, which was a bit strange.
“There’s always something going on in this street and there’s police driving up and down here all the time.”
Paul Nands, 21, added: “I saw the police sitting outside the house all day and then they emptied it out.
“They filled a skip with plants and pots and other stuff and then left.”
Police said they launched the operation, which took place on Tuesday morning, after receiving a tip-off from the community about suspicious activity at the house.
They claim the haul could have cultivated up to three times the amount as the plants could have had more than one yield.
Sunderland West Neighbourhood Inspector Dave Pickett, said: “This is an excellent example of the vital role members of our community play in helping us to tackle suspected criminal activity and help rid our streets of illegal drugs.”
A number of the people arrested will now be dealt with by UK Borders Agency.
Anyone with any information about drug dealing or cultivation should contact Northumbria Police on 101, or Crimestoppers anonymously on 0800 555 111.