A drugs trafficker has been caught with €750,000 worth of heroin.
The 38-year-old man, who is from Limerick and does not have any previous convictions, continued to be questioned at Dundalk garda station in Co Louth last night.
A senior source described the arrested man as a "sole operator" who was not strongly linked to any of the well known crime gangs.
The bust happened at around 10pm on Monday when gardai from the Garda National Drugs Unit and Organised Crime Unit seized heroin with an estimated value of €750,000 following the search of a car at Castlebellingham, Co Louth.
It is understood that the suspect had been under detailed surveillance by specialist officers for some time.
The arrested man was previously the subject of alleged chilling threats over the past year but it has never been verified how serious the threats against him are.
It is understood that he alleged that he had received threatening phone calls as part of a dispute with another man.
Sources say that the arrested man may have links to a drugs bust which happened in August last year at Rosslare Europort.
The man was never arrested and charged in relation to the seizure of €1m worth of cannabis on that occasion, a crime for which a 23-year-old Northern Irish man is serving a three year jail sentence.