Gardaí investigating the fatal stabbing in Rialto, Dublin, yesterday have arrested a woman in her 40s.
They arrested her at around 1pm this afternoon in Dublin and she is being detained in Pearse Street Garda station under Section 30 of the Offences Against the State Act.
Two teenage boys remain in custody in Kevin Street Garda station.
At around 5.30am yesterday morning, two men were stabbed several times in the Herberton apartments on St. Anthony's Road in Rialto.
Both were taken to hospital where one man died, and the other is now said to be in a serious, but stable condition.
Gardaí continue to appeal for witnesses to contact them at Kilmainham Garda station (01 666 9700), on the Garda Confidential Line 1800 666 111, or at any Garda station.