CANNES, France – U2 lead singer Bono had emergency surgery on his back in a Munich hospital on Friday after being injured while preparing for the next leg of a world tour, the first date of which has been postponed.

The 50-year-old from Ireland had been getting ready for the North American leg of the “360 Degree” world tour which had been due to kick off in Salt Lake City on June 3, according to a statement first released to Reuters.

The band’s website confirmed that Salt Lake City had been postponed.

Paul McGuinness, the group’s longstanding manager, hinted that the injury could cause further postponements.

A spokesperson for Bono said the singer was admitted to a specialist neuro surgery unit in a Munich hospital.

“Bono will spend the next few days there, before returning home to recuperate,” the spokesperson added. “Once his condition has been assessed further, a statement will be made regarding the impact on forthcoming tour dates.”