A 22-year-old man has suffered multiple stab wounds in an attack at Scotland's T In The Park music festival.
Detectives are looking for two men in connection with the incident, which happened in the campsite area at about 12.45am today.
The victim was treated by an onsite doctor then rushed to Dundee's Ninewells Hospital, where he is now in a serious but stable condition.
Detective Chief Inspector Bruce Kerr said: "This has been a horrific assault on a 22-year-old man who sustained multiple stab wounds. It was a very serious incident where a camper was seriously assaulted and stabbed numerous times in the head and body."
Police are trying to trace the two males, whose clothes are likely to be bloodstained, as well as the weapons used, said DCI Kerr.
Another man was found dead in his tent in a separate incident today.
Acts appearing at the festival include REM, Rage Against The Machine and The Verve.
Two people dying at the same event on the same day is shocking.