Romainian pickpockets are "going on tour" with popular rock bands to steal hundreds of mobile phones from fans, police say.
British tours by acts including The Libertines, Slipknot and Kasabian have been plagued by the crime gangs in recent years.
Teams of thieves get tickets for every gig, and each night take advantage of the dark and crowded venues to steal the latest smartphones from bags and pockets.
Dozens of the handsets are then handed to accomplices, who stuff them down trousers or tights before leaving the venue.
In summer months, the gangs, who can travel freely across borders thanks to EU free movement rules, turn their attention to outdoor music festivals.