Dublin gardaí are investigating an knife attack on a man at a railway works near Shankill Dart Station shortly after 4am.
The victim (19) was taken to St Columcilles Hospital, Loughlinstown and later transferred to St Vincent's Hospital, where his condition is described as critical.
Two men, aged 22 and 23, were arrested and are being held at Shankill Garda station under Section 4 of the Criminal Justice Act.
Gardaí have appealed for anyone with information to contact Shankill Garda Station on 01-6665900.