Four people have been arrested and a gun seized by gardaí investigating the ongoing feud in Finglas in Dublin.
Gardaí carried out a series of searches at two houses this morning. A gun and a silencer were found concealed in one of the houses.
A man in his 30s and two women in their 20s were arrested at the scene.
In a search of another house, a man in his 20s was arrested over firearms offences relating to an incident which occurred in January.
All four are being detained at Finglas and Blanchardstown garda stations and can be questioned for up to three days.
Following the arrests, a house on Ratoath Road was attacked and petrol bombed.
It is the second house in the area to be burned out in the last six days. Dublin Fire Brigade were called to the scene and the house has been boarded up.
There have been more than 70 violent attacks as part of the ongoing feud including shootings, assaults, petrol bombings and a murder.
The Garda Commissioner said gardaí were very concerned about the attacks and the ongoing threats from two gangs who seem "hell bent" on feuding with each other.
Drew Harris said additional resources, including armed patrols, had been put in place and as well as an intensive investigation, he said gardaí were putting a lot of effort into to "nipping the so-called feud in the bud as quickly as possible."
He also said gardaí recognise the public’s concern and that the vast majority of people in Finglas totally reject this violence.
Commissioner Harris said gardaí want to provide a service to them and he appealed to anyone with information to contact them.