Two men are fighting for life following separate attacks in Galway and Dublin.
The first happened in the capital's Talbot Street on Wednesday night.
The incident is believed to have happened at around 10.40 pm when a group attacked an American tourist.
The man, aged in his 50s, was taken to Beaumont Hospital where his condition is described as serious but stable.
Meanwhile, a man in his 30s is in 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.
Gardaí are appealing for any witnesses to these assaults to come forward.
