Gardaí investigating the activities of the Kinahan crime gang have carried out a number of raids in Dublin.
Drugs, cash, phones and financial documents have been seized.
One man, who was arrested on suspicion of drug trafficking, has been released without charge.
A file will be sent to the Director of Public Prosecutions.
The operation, led by the Drugs and Organised Crime Bureau, began at around 7am.
More than 50 gardaí from local and specialist armed units searched seven homes in Dublin's north and south inner city.
They discovered financial documentation relating to international bank transfers, eight phones, including encrypted phones costing €1,500 each, and a quantity of heroin.
The drugs were found in the home of a north inner city dealer, bagged for sale on the streets with a customer tick list.
The 24-year-old man was arrested on suspicion of drugs trafficking and was questioned at the Bridewell Garda Station.
He has since been released without charge. A file will be prepared for the DPP.
Gardaí say the operation is focused on the activities of Kinahan crime gang members and associates in Dublin, on identifying its network and dismantling its structure.
Evidence is being gathered in relation to drug dealing, the movements of money across international borders and the gang's secure communication system.
The Assistant Commissioner in charge of Special Crime Operations, John O'Driscoll, said gardaí are focused on the gangs involved in a wide range of criminal activity, including drug dealing and attempts to murder people.
Eighteen people have been shot dead as part of the ongoing feud between the Hutch and Kinahan crime gang.
The last person to die was Jason 'Buda' Molyneux nine months ago, but gardaí say they remain on high alert and are continuing to police the feud in a visible and proactive manner.
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