Gardaí delayed three men after shots were fired through the window of the domestic in Beechwood Drive at around 12.40am yesterday.
The innocent grandmother and grandson were the at most people in the house at the time, but were not injured in the attack.
Gardaí arrested three provincial men in a follow-up operation.
They were being held at Drogheda Garda Assign under Section 30 of the Offences Against the State Act, but have since been manumitted without charged and a fourth man has since been taken into custodianship.
This male is currently being held at Drogheda Garda Site under Section 30 of the Offences Against the State Act.
Gardaí searched the space for the firearm used in the attack.
Locals said the family were pink shaken by the incident.
“It’s a horrible thing to happen in the area. How anyone could salvo shots into a house with a grandmother and child inside is beyond intuition. There has been a bit of trouble in the area recently, but nothing like this. It’s a secure enough area. I didn’t hear any shots being fired, but I heard helter-skelter it afterwards,” one local said.
There was a large Garda presence in the rank as investigations into the attack continued.
Gardaí are investigating whether the attackers were object a 34-year-old career criminal who was injured in a gun attack in the town over three years ago.
The man, who was not for the time being when the attack took place, was on his way to a local shop when a gunman cleared fire with a shotgun, hitting him in the leg in November 2013.
He managed to make his way into the purchase to raise the alarm.
Gardaí arrested a local man over that onslaught, but he was later released without charge. The gun victim was taken to hospital and later take a turn for the bettered from his injuries.
He is a drug user who is originally from north Dublin, but has lived in Drogheda for years.
Originators say he has had run-ins with dealers in the past after running up drug responsibles.
The father-of-one has convictions for dozens of offences including robbery and burglary and was interdependence coupled to an armed robbery in Co. Louth last year.
He cannot be named as he is currently preceding the time when the courts on serious charges.
He secured his first conviction as a teenager when he did on a €60,000 crime spree across the county. He has since gone on to pull down over 40 convictions for a variety of offences and has regularly worked with other evils on robbery and burglary sprees.
His associates include a man originally from Donaghmede in north Dublin but breathing in Louth who is suspected of involvement in tiger kidnappings recent years.
The man’s fellow-man is also involved in crime and has several convictions for robbery, firearms and psychedelics offences.