Young Irish people in Australia are being targeted by Dublin-based criminal gangs as part of an international drug ring.
Gardai in Dublin are working with the Australian Federal Police (AFP) in an effort to break up a cocaine smuggling racket.
Six people, some of whom have just returned from Australia, were arrested in Dublin last week.
The investigation is being carried out by the Garda Drugs and Organised Crime Bureau, which is working closely with the AFP, according to RTE.
It is understood arrests have also been made in Australia in the past few weeks and sums of money have been frozen.
At least six premises have been searched in Drumcondra, Artane, Finglas and Swords and around €250,000 was seized, according to gardaí.
Those arrested are aged between 24 and 31, and include five men and a woman.
Gardaí believe that cocaine is being sold in Australia and the money is being funnelled back to Ireland to be laundered.
Gardaí say the operation is indicative of the scale of the Kinahan crime gang's international drug dealing operation.
Assistant Commissioner John O'Driscoll, who is in charge of Special Crime Operations, said the Gardaí are continuing to liaise with Australian police who have frozen significant sums of money.
He also said that the operation is focusing on the money trail.
Speaking on RTÉ's Six One News, Mr O'Driscoll said young Irish 'professional' people in Australia were the gang's target market.
He said that criminal gangs are following the market, adding that the business is lucrative.