GARDAI have arrested 29 people in Cork city for a number of incidents including threats to kill, robbery and drug dealing.
The day of action was carried out yesterday through Operation Thor.
Gardaí said that 23 of those arrested had bench warrants out for them. They were all brought to court.
The other six were released without charge and files are being prepared for the DPP.
Gardaí said that five premises across the city were searched through the operation, leading to the seizure of cannabis herb, cannabis resin, ecstasy and heroin.
These substances will now be analysed to establish purity and value. A preliminary value of €12,600 has been put on the haul. Three people were questioned in relation to the seizures.
"The operations conducted were carried out by local Gardaí along with Detective, Immigration, Drugs Units, Roads Policing Unit, Dog Unit and the Armed Support Unit," a Garda spokesperson said. "Assistance for the Checkpoint Operation was provided by Revenue and Customs officers and the Department of Social Protection."
He added: "As part of the day of action, two multi-agency checkpoints were carried out on the South Link road and North Ring Road.
"Immigration and Department of Social Protection have a number of follow up investigations to conduct.
"Revenue and Customs Officers checked 60 vehicles for the presence of green diesel with 0 detections.
"32 People were screened by Social Protection Inspectors with a number of follow up investigations to be conducted.
"A further nine checkpoints were conducted by Roads Policing, Detective Branch and regular unit which resulted in a number of road traffic offences being detected."
A crime prevention talk was given in Ballinlough community hall while there was also a crime prevention stand in Merchant's Quay Shopping Centre.
Gardaí also visited schools with a message about road safety, crime prevention and anti-social behaviour.