Detectives are trying to establish which gang was responsible for the €6.2m worth of drugs seized yesterday by customs officers at Dublin Port.
One line in the investigation is that the massive haul of cocaine and cannabis - one of the biggest busts of the year - may have been sent here for distribution by the Kinahan cartel, but this has not been confirmed.
"There are not too many gangs operating in the State that would be able to organise such a huge shipment, but the Kinahan cartel are certainly one organisation that could have," a source said last night.
"These drugs originated in Holland, and what has also been seen in recent times is that gangs in Ireland are clubbing together when purchasing drugs on this scale."
Revenue announced details of yesterday morning's massive bust.
"As a result of routine profiling, Revenue officers seized 93 kilos of herbal cannabis with an estimated value of €1.9m and 62 kilos of cocaine with an estimated value of €4.3m," a spokeswoman said.
"The drugs were discovered following the search of a curtain-sided trailer which had arrived into Dublin Port from Rotterdam.
"The search, with the assistance of Revenue's mobile X-ray scanner and detector dog Robbie, led to the discovery of the drugs concealed within a number of hot water cylinders.
"A Northern Ireland-based haulier was arrested at Dublin Port by the Garda National Drugs and Organised Crime Bureau (DOCB).
"A UK-registered truck and trailer were also seized by Revenue officers."
The truck driver was being detained at Store Street Garda Station last night, with officers attempting to carry out "full background searches on the suspect to determine who he was working for".
He can be held for up to seven days.
The DOCB has carried out a number of separate investigations this year into gangs in the North that have been working with drugs trafficking crews from the Republic.
Gardai said yesterday's seizure is one of the biggest of the year, and they believe it may have a "significant temporary impact" on the cocaine market.
It has been a bumper week for revenue at Dublin Port, with officers seizing 3.5 million cigarettes and 3.9 tonnes of processed tobacco at the facility on Tuesday.
"Both shipments originated in Germany and have a combined retail value of €3.8m," a spokesman said.