An investigation is underway after a gun and silencer were found in a van in Dublin on Wednesday.
Armed gardaí fired a number of shots when the vehicle failed to stop in Inchicore shortly before 3.00pm.
Officers seized a gun and a silencer and a man aged in his 20s was arrested at the scene.
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He is being held at Ballyfermot garda station.
Another vehicle, which is believed to have been involved, fled the scene.
The Garda Ombudsman Commission has been notified of the incident.