Three people were stabbed after a fight broke out during a Swedish House Mafia show at the Milton Keynes Bowl in England on Saturday.
According to police, one of the victims, a 23-year-old man, remains in hospital with a punctured lung.
Another, a 24-year-old man, received a cut to his head and arm but was discharged from hospital, and a 23-year-old man was treated for minor injuries by an ambulance crew.
The knife fight in Milton Keynes comes just a week after widespread public disorder at a performance by the same act in Dublin. Nine people were stabbed, two died from drug overdoses and over 30 were arrested at the Phoenix Park show.
Detective Chief Inspector Justin Fletcher said the latest stabbing appears to have been "an isolated incident". "Overall we are very pleased with how the event passed off," he said.
During the concert, three people were also arrested on suspicion of drug dealing.