Gardaí are questioning six people following two separate drug seizures in counties Kildare and Meath last night.
In Co Kildare five men were arrested following the discovery of 15ks of heroin at a house in the Robertstown area.
Units from the Organised Crime and Naas Detective divisions arrested four of the men at the scene while the other was detained as part of a follow up search.
A Garda spokesman said the seizure has a potential street value of in excess of €2 million.
The men are being held under section 2 of the Drug Trafficking Act at Naas, Newbridge, Kildare and Lucan Garda stations.
Elsewhere, gardaí in Dublin are continuing to question a man following the seizure of 1.1 tonnes of cannabis resin during a joint Garda and Customs operation at an industrial premises in Dunboyne, Co Meath last night.
This seizure, subject to analysis, has an estimated street value of €6.6 million.
The man in his 30s was arrested close to the scene and is being held at Blanchardstown Garda station also under Section 2 of the Drug trafficking Act.