Detectives seized more than €100,000 in cash in their latest operation against the Kinahan cartel after they intercepted two vehicles on the capital's Naas Road.
The primary target of the operation is a 41-year-old Drimnagh man who, despite having barely any criminal convictions, is suspected of becoming a key player for the cartel in recent months.
Two women, aged 38 and 29, were also arrested in the Garda National Drugs and Organised Crime Bureau surveillance probe on Tuesday.
All three were still being questioned last night at Clondalkin, Ballyfermot and Ronanstown garda stations, where they were being held under money laundering legislation.
Gardaí announced details of the cash seizure, saying it was part of "an ongoing intelligence-led investigation targeting serious and organised crime" and that the bureau was supported by a special crime task force for vehicle interception.