The Criminal Assets Bureau (CAB) carried out seven searches at dawn yesterday, targeting a criminal who was very closely linked to notorious gang boss Cyril 'Dublin Jimmy' McGuinness.
Two homes, two businesses and three professional offices were raided in the operation, but no arrests were made.
The target of the operation was a man in his 60s based in Co Cavan. A storage yard and breaker's yard connected to him were raided.
"Phones, documentation and laptops connected to him were seized, but this is not the first time gardaí have seized devices from him in the past year," a senior source said.
The home of a man linked to this suspect was also raided. Two professional offices in Co Cavan and one in Dublin were also searched.
CAB officers were backed up by the Emergency Response Unit (ERU) for the four searches in Co Cavan, which were part of a wider investigation into the harassment and attacks on executives of Quinn Industrial Holdings.
The CAB target's close pal, criminal McGuinness (54), died of a heart attack last November in England when police raided a safe house he was hiding in. The raid was part of a major arrest operation concerning the Kevin Lunney case.
Father-of-six Mr Lunney was abducted close to his home in Co Fermanagh on September 17 last year.
His leg was broken, he was doused in bleach and the letters "QIH" were carved into his chest during the two-and-a-half-hour ordeal before he was dumped on a roadside in Co Cavan.
Four suspects have been charged with falsely imprisoning and assaulting him, but gardaí have said their investigations are "far from over".
CAB officers, armed gardaí, detectives from the Garda Stolen Motor Vehicle Investigation Unit (SMVIU) and the Revenue Customs Dog Unit were involved in yesterday morning's searches.
"A number of properties were searched as part of today's operation, including residential dwellings and business and professional premises," a garda spokesman said.
"During the course of this operation, a number of electronic devices, including mobile phones and computers, along with documentation relating to financial matters and property ownership was seized.
"This search operation was conducted as part of the Criminal Assets Bureau's investigation into events which commenced circa January 2015.
"These include the harassment of senior officials of a commercial entity known as Quinn Industrial Holdings, which escalated from 2016 onwards to include criminal damage, assault causing harm, false imprisonment, blackmail and extortion."
It previously emerged that gardaí uncovered a network of front companies and bank accounts used to launder money paid to McGuinness, who led the campaign of harassment.
Millions of euro were funnelled through the bank accounts of up to five bogus companies.
They were registered in Ireland and ostensibly set up to buy and sell plant machinery.
Investigations have established that associates of McGuinness bought farms as part of the money laundering operation.
A London construction company and a large UK property portfolio, which is owned by one of his closest associates from Co Cavan, is also being investigated.