Three men were being questioned today about a seizure of cannabis resin worth £300,000 sterling on the streets in Derry.
They were arrested after police found the drugs when they stopped a car on the Glenshane Road in the city yesterday.
House searches were later carried out across Derry, with police claiming the operation showed their commitment to fighting the supply of drugs.
Detectives believe the consignment seized was to be distributed throughout Derry.
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Inspt Trevor McKeown said: "We have no doubt this seizure has disrupted the activities of criminals, but are also aware this is an issue that demands our constant attention. "With the support of the community we will continue our efforts to tackle drug dealing in this area."