Gardaí are questioning a man in relation to a number of stabbings in Stillorgan last night.
Three men were injured in the incident which happened between 11.15 and 11.30pm on the Upper Kilmacud Road.
It is understood the three men received stab wounds. They were brought to St Vincent's Hospital for treatment. One of the men, believed to be in his 20s, was seriously injured.
One man, in his twenties, was arrested and is being held in Dundrum garda station.