A man in his 20s remains in a serious condition after he was seriously assaulted in Dublin city centre on Sunday morning.
Gardai have arrested two men and two women, all in their 20s, in connection with the assault.
The assault happened at Lamb Alley, Dublin 8, between 1am and 1.30am on Sunday morning, and gardai are appealing for a taxi driver to come forward with information.
The injured man was discovered with serious head injuries and was removed to St. James’ Hospital and subsequently transferred to Beaumont, where he remains in a serious condition.
The two men are detained under Section 4 of the Criminal Justice Act, 1984 and the women are detained under Section 30 of the Offences Against The Persons Act, 1939.
The four are being held at Irishtown, Pearse Street, Kevin Street and Kilmainham Garda Stations and all remain in custody.
Gardai say they are specifically looking to speak to a taxi driver who picked up two men on Meath Street at around 1.15am on Sunday morning.
The taxi was a dark or black saloon and possibly an Opel Insignia.
The men travelled a short distance and were dropped off on to Francis Street.
Gardaí are also looking for anyone who was in the Meath Street, Lamb Alley area between 1am and 1.30am to contact then at Kevin Street Garda Station on 01 666 9400