Seventeen people were arrested as part of Operation Thor in Cork on Thursday.
The arrests, as part of a day of action, related to a number of incidents - such as suspected possession of child pornography, assault, burglary, theft, drugs and immigration offences.
A man in his 40s was arrested in relation to suspected possession of child pornography in the Ovens area.
He was detained at Gurranabraher Garda station and has since been released.
A file will now be prepared for the Director of Public Prosecutions (DPP).
While five people were arrested for immigration offences and have since been returned to Spain.
Three people were arrested on foot of bench warrants and brought before the courts.
And eight people for arrested for drugs, burglary and theft offences.
They have all since been released and a file will be prepared for the DPP.
A total of six premises were searched under warrant, which saw the seizure of small quantities of suspected MDMA, cocaine and cannabis.
The operations were carried out by local Gardaí along with Detective, Immigration, Drugs Units, Roads Policing Unit, Dog Unit and the Armed Support Unit.
A number of checkpoints were also carried out - with over 2,000 vehicles passing through.
Ten road traffic offences were detected.