Five young men were injured early today in an incident at the Oxegen music festival in Punchestown, Co Kildare.
The altercation happened at the Blue Campsite shortly after 4am when a row broke out. The teenagers suffered slash wounds.
Four of the youths were treated for their injuries on site, but the fifth person, a 19-year-old, was taken to Tallaght Hospital.
Gardai are investigating the incident and the families of the injured have been informed.