Four people were being questioned by police in the North tonight after a major counterfeit DVD production plant was uncovered.
Equipment valued at thousands of pounds was seized after being discovered during a wave of searches in Londonderry.
It was the latest part of a major drive against organised crime in the north west in recent weeks which has seen arrests and seizures of DVDs and CDs in a number of operations.
At least a dozen houses in the city and the market in Sackville Street were targeted in the latest swoop.
A sum of cash was also seized under the Proceeds of Crime Act together with a number of counterfeit DVDs, said a police spokesman.