A man has been arrested as part of an ongoing investigation into the theft of catalytic converters.
On 16 April catalytic converters worth around €480,000 were sized in Dublin Port.
As part of a follow-up operation, gardaí stopped a vehicle on the N7 yesterday and found 23 catalytic converters valued at €23,000.
In another search at a storage facility in Dublin 11, 135 converters were found with an estimated value of €108,000.
A man in his 30s was arrested and questioned at Ballymun Garda Station.
He has since been released without charge and a file is being prepared for the Director of Public Prosecutions.
Gardaí say investigations are ongoing.