A 22-year-old man has been arrested after police found him with 53 stolen mobile phones after a Royal Blood gig.
Officers carried out a “proactive” operation after receiving intelligence that previous gigs by the rock band had been targeted, West Midlands Police said.
The man was detained on suspicion of theft in Broad Street, near to the concert at Arena Birmingham, on Saturday night.
Officers said the majority of victims had been identified but urged others to get in contact.
Detective Sergeant Jeff Clifford of CID, said: “It’s an unfortunate reality that large crowds at concerts such as this make rich pickings for career criminals.
“We’re hot on the heels of these offenders but you can also reduce your chances of falling victim to such crimes by remaining extra vigilant when attending busy events.
“If you think you had your phone taken last night, please get in touch with us and we can check whether or not we have been able to recover it.”