A man was rushed to St Luke's Hospital in the early hours of Easter Monday morning with injuries following an assault in John Street.
The man was attacked and set upon by a group at approximately 4 am.
Gardaí are appealing for witnesses to come forward.
“It was a busy night and people should come forward and contact us in relation to this vicious attack,” a garda spokesman said.
The injuries were to the man's face and are not believed to be life-threatening.
Gardaí are currently examining CCTV from a number of locations in the John Street area in relation to the assault.