Gardaí in Co Kildare are continuing to question a man in connection with the seizure of about €400,000 worth of heroin in Clane yesterday.
A 23-year-old man who was also arrested yesterday has been released without charge, a Garda statement said.
A file is being prepared for the Director of Public Prosecutions.
The second man remains in custody.
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Gardaí searched the Clane apartment as part of an ongoing operation targeting the sale and supply of drugs in west Dublin. Two kilos of heroin and a small quantity of cocaine were seized during the course of the search, gardaí said.