The two men and one woman, all aged in their 20s, who were arrested as part of an investigation into the assault of a man in Monaghan town have since been charged.
All three are expected to appear before Cavan District Court on Friday.
The man (40s) who was assaulted was left in a critical condition.
The incident happened in the Park Road area of the town between 10pm and 11pm on Tuesday.
He received life-threatening injuries and was brought by ambulance to Our Lady of Lourdes Hospital, Drogheda.
He was then transferred to Beaumont Hospital in Dublin and his condition is described as critical.
