Gardaí seized a loaded sawn-off shotgun in Dublin in the early hours of Monday.
Officers on patrol in Crumlin came across a car which sped off before cutting out on Kilfenora Road in Kimmage at about 12.45am.
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A woman in her 30s and two men in their 20s and 30s were arrested.
The shotgun and car were also seized.
All three people are currently detained under Section 30 of the Offences Against the State Act, 1939 at Garda stations in the Dublin Region.