Cocaine worth about eight million euro and two guns have been discovered in a planned raid on a house, gardai said.
Detectives swooped on the home in the Terenure area of south Dublin on Sunday night and uncovered the massive drugs haul.
No arrests have been made.
The drugs seizure was being linked to ongoing investigations into major crime gangs in south Dublin.
A Garda spokesman said the cocaine could have a street value of up to 8.5m euro, subject to analysis. The two firearms were described as semi-automatic handguns.
A cocaine mixing plant was also uncovered inside the home.
The search operation was carried out by officers from Kevin Street Station and gardai from Terenure as part of a continuing investigation into organised crime.