Gardai have seized guns, ammunition and a large quantity of drugs in two separate organised raids.
On Saturday morning, a Glock semi-automatic pistol and a .22 calibre handgun as well as three other handguns were found after officers searched two house in Deerpark Rise in Tallaght.
Gun magazines and a large quantity of ammunition were also seized, as well as cannabis herb and ecstasy tablets with an estimated street value of up to €250,000.
In the planned operation targeting organised crime, gardai from the Organised Crime Unit, assisted by members from the Garda national drugs unit, crime and security, the emergency response unit and local units from Tallaght arrested one man and two women who were taken to Rathfarnham, Tallaght and Terenure Garda Stations.
The 24-year-old man was still being detained last night under Section 30 of the Offences Against the State Act at Rathfarnham Garda Station.
A 33-year-old woman, who was held at Tallaght, was later released but is due to appear before Tallaght District Court later this month in relation to the seizure.
A 32-year-old woman held at Terenure Garda Station was released on Saturday night and a file is to be prepared for the Director of Public Prosecutions.
The operation in Tallaght is targeting a criminal known locally as Mr Pipebomb.
He is believed to have previously been an associate of Keith Ennis – the Walkinstown man who was stabbed to death, and his body cut into pieces and dumped in a suitcase in a canal on the northern outskirts of Amsterdam in March 2009.
Meanwhile, in Kilkenny one man was arrested and €560,000 worth of cocaine seized when gardai from the regional support unit stopped a van at Jordanstown, Paulstown, Co Kilkenny on Saturday evening at approximately 6.30pm.
A 38-year-old man arrested under Section 2 of the Criminal Justice Act at the scene can be held for up to a week at Thomastown garda station in Kilkenny, where be is being questioned over the haul.
The seizure was made as part of on-going intelligence-led operations targeting the sale and supply of drugs in the south east.
Gardai said these operations use advanced analytical and intelligence methods to disrupt criminals and dismantle their networks.
“Drug seizures play a critical role in targeting the livelihood of criminals and reducing their ability to carry out illegal activities,” said a Garda Siochana spokesman.
“Drug seizures also help protect communities from the devastating impact of drugs and the associated criminality,” he added.