Gardaí are investigating an assault at the Oxegen music festival in Co Kildare in the early hours of this morning.
Five men in their late teens are believed to have received stab wounds in the incident at the blue campsite shortly after 4am.
It is understood that a row broke out between two groups of teenagers and that members of one of the groups, who are from Northern Ireland, were attacked with a knife.
Four of the men were treated for their injuries on the site and one man, aged 19, was removed to Tallaght Hospital. His injuries are not thought to be life threatening.
The families of the injured men have been notified.
No-one has been arrested in connection with the assault. A weapon has been recovered by gardaí. Anyone who witnessed the incident or may have information about it is asked to contact the gardaí at Naas on 045 897333, the Garda Confidential Line on 1800-666-111 or any Garda Station