Gardai are investigating two separate assaults in Galway and Dublin which left two me in a critical condition.
A man aged in his 30s was assaulted in Galway in the early hours of Thursday morning while in Dublin a man in his 50's was attacked on Talbot Street late on Wednesday night.
The incident in Dublin is believed to have occurred at around 10.40 when a number of individuals attacked an American tourist.
The man, aged in his 50s, was taken to Beaumont Hospital where his condition is described as serious but stable.
In the second incident a man in his 30s remain in a critical condition following an assault on Dominic Street in Galway in the early hours of Thursday morning.
He was taken to University Hospital Galway by ambulance but was later transferred to Beaumont Hospital where he remains in a critical condition.
Gardaí are appealing for any witnesses to this assaults to come forward and contact them.