The Army Explosive Ordnance Disposal (EOD) Unit was summoned to the Whitehall area of Dublin on Tuesday evening following reports of a suspicious device in the area.
Five Garda vehicles and a number of armed soldiers were spotted near Santry Park and a cordon was established at Schoolhouse Lane.
The device was found to be nonviable after an examination by experts and the Garda cordon was lifted.
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Enquiries remain ongoing.