More than 40 homes were evacuated in the early hours of yesterday after a suspicious device was found in the front garden of a house.
The alarm was raised at around 1.15am when the package was first reported in the front garden near the house in Oak Green, Santry.
Gardai went to the scene after they received an anonymous tip-off from a member of the public.
A decision was made to call the Army bomb squad to investigate further.
They arrived from a Dublin location under a garda escort.
A decision was taken to evacuate 46 homes on the quiet and mature cul-de-sac in the Royal Oak estate for precautionary reasons while the assessment was taking place.
It is understood the evacuation involved more than 60 people.
"The weather was very bad at the time, with rain falling heavily," said one local source.
"It was a difficult operation and a major inconvenience to the local residents, who were naturally concerned."
The bomb squad used a remote-controlled robotic device to assess the package and created images of its internal structure by using X-ray technology.
It was later declared non- viable and was handed to gardai for further forensic investigation.
Residents were allowed to return to their homes at around 4.30am.
Gardai are investigating if the incident is connected to the Kinahan/Hutch feud or other organised crime groups.