A 14-year-old boy is still being held by gardaí investigating a shooting in the St Mary's Park area of Limerick earlier this week.
The shooting took place at 6.15am on Wednesday when a shot was fired at a house on St Munchin's Street. The house was occupied, but nobody was injured.
There was a similar attack on another house in the same estate on Sunday morning.
Two teenagers were seen running from the scene of the shootings, and a sawn-off shotgun was found by gardaí nearby.
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An 18-year-old youth and the 14-year-old were arrested at 10am. The older youth has been freed.
The 14-year-old had been arrested and released by gardaí just hours before the gun attack after he was stopped driving a car near the estate while wearing a bulletproof vest.