A woman is in custody today following the seizure of a 9mm handgun in a raid on a property in west Dublin.
The 26-year-old was detained at an address at Grange View Road in Clondalkin last Sunday night in a major anti-gangland operation carried out by Clondalkin gardai.
Three men, aged 24, 23 and 20, were also held by officers in the raid on the property.
During a search of the house a 9mm handgun and two bullet-proof vests were discovered, along with heroin worth €4,200 and drug paraphernalia.
The planned search of the property was carried out by armed gardai who entered the house at 9pm on Sunday.
The group are suspected members of a gang supplying drugs to the Clondalkin area.
They were arrested under section 30 of the Offences Against The State Act, used for the investigation of firearms offences, and can be held for up to three days.
A decision to charge or release the woman and three men will be made later today, it is understood.
The operation was carried out by officers from Clondalkin Drugs and Detectives Units, backed up by armed officers from Operation Anvil.
The search was the latest in a series of ongoing anti-gang operations carried out by local officers.
They scored a major success last week with the unrelated jailing of a Clondalkin criminal for six months after he drove at speed through an estate, narrowly missing young children.
Graham Dutton (25) endangered the lives of his girlfriend and seven-year-old daughter by speeding through Clondalkin estates, a court heard. He is currently appealing a 10-year sentence for possession of heroin and cocaine.