An 18-year-old man was arrested after bomb disposal experts were called to a house in north Dublin last night.
The Army Explosive Ordnance Disposal team found no viable device at the scene in Buttercup Road in Darndale.
However, some component parts of a potential device were discovered.
Gardaí arrested a man and recovered a small quantity of drugs.
In a separate incident, a device was thrown at a house in Edenmore Park in Raheny.
It exploded and damaged the front room window.
A number of people were in the house at the time but were uninjured.