At approximately 4.45pm this afternoon Gardai were called to a report of a male armed with a firearm in the Poppintree area of Ballymun. Garda Armed Support Units and local units were dispatched to the scene.
A male in his 30s was arrested shortly afterwards by unarmed Gardai and a firearm recovered at a house on Cranogue Road, Ballymun. He was conveyed to Ballymun Garda Station where he is currently detained under the provisions of Section 30 of the Offences Against the State Act.
The area around the house was sealed off due to the discovery of a device in the house and the Defence Forces Explosive Ordinance Disposal team are currently at the scene.
Commissioner Harris said: "The Gardai involved showed great bravery in ensuring the safety of the public."
Gardai are appealing to any witnesses who may have been in or around the area at the time of the incident to contact Ballymun Garda Station on 01 6664400, The Garda Confidential Telephone Line 1800 666 111 or any Garda Station.
