A total of 11 people are now in custody following drugs seizures in Dublin and Roscommon.
In Boyle, Co Roscommon, gardaí have arrested three people and seized over a €100,000 worth of cocaine, ecstasy, cannabis and around €5,000 in cash.
The arrests were made following a raid on a house between Boyle and Tulsk earlier this morning.
The three - two from Roscommon, one from west Dublin - are being detained at Boyle Garda Station under Section 2 of the Drug Trafficking Act.
Gardaí believe the drugs came from a Dublin criminal gang and were being held for distribution at the forthcoming Electric Picnic festival.
Elsewhere, eight men are being questioned in Dublin following two separate drug seizures in the city last night.
Just before 6pm last night, armed officers from the Organised Crime Unit intercepted the handover of 36kg of cannabis herb at Airside Retail Park in Swords.
Five men were arrested following the seizure of the estimated €500,000 worth of drugs.
Some of those in custody are connected to one of the two feuding Crumlin-Drimnagh criminal gangs, believed to have paid in full for the drugs it has now lost.
Another man held is an accountant working for one of the major banks.
In Rathcoole, three men were arrested and 500kg of cannabis resin was seized as part of an investigation into a west Dublin gang.
The men were detained following an investigation by the Clondalkin drugs unit into the activities of one of the capital's biggest gangs, which was also a target of the specialist units.
Officers backed up by the Garda National Drugs Unit and armed units from the National Support Services, searched cars and vans in the Greenogue Industrial Estate in Rathcoole at around 9pm.
The scene, along with an industrial unit, was preserved as a crime scene for technical examination.
Gardaí say the drugs have a potential street value of €2m.
The three - aged 28, 35 and 36 - are from Tallaght and Clondalkin and are being questioned at Clondalkin Garda Station.
One is believed to be the leader of the gang involved in a feud in west Dublin and whose activities include drugs and firearms trafficking.
In a follow-up operation €170,000 worth of cigarettes with a potential loss of revenue of €49,000 was seized along with €100,000 in cash.