U2 frontman Bono has undergone emergency surgery in a Munich hospital, according to a spokesperson.
A statement said that the 50-year-old singer injured his back while preparing for the next leg of the band's world tour.
A spokesperson said: "Bono has today undergone emergency back surgery for an injury sustained during tour preparation training."
"He 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."
"Once his condition has been assessed further, a statement will be made regarding the impact on forthcoming tour dates."
