Police officials in England are on the hunt for a man who stabbed three Swedish House Mafia fans at a show in Milton Keynes on Saturday.
One of the men, a 23 year old, is being treated for a punctured lung at Milton Keynes General Hospital, while the other two were both treated for minor injuries and cuts.
Police have asked concertgoers who may have spotted the attacker, who they describe as a white male in his early 20s wearing a Nike T-shirt, black jacket and black jogging bottoms, to get in touch, especially if they witnessed the incident or "captured it on their camera or mobile phone".
Saturday's stabbing incident comes a week to the day after a Swedish House Mafia show in Ireland was marred by violence.
The DJ supergroup was performing at Dublin's Phoenix Park when a knife attacker left nine gig-goers injured.
Police believe one man stabbed up to four revellers, and that other crowd members sustained injuries during incidents involving knives and broken bottles.
A 23-year-old man was charged in connection with the incident.
Swedish House Mafia concert stabbing comes one week after previous concert violence