A 29-year-old man was arrested last night on suspicion of drugs offences following a police search in the Waterside.
Chief Inspector Tony Callaghan said that what are believed to be the remnants of a cannabis factory were found during a search at Prehen Park.
The man was arrested in suspicion of possessing a Class B drug; possessing it with intent to supply; cultivating cannabis and being concerned in the supply of a Class B drug.
A small quantity of suspected cannabis and other paraphernalia were seized.
The man was later released pending further police enquiries.