U2 frontman Bono has undergone emergency back surgery at a hospital in Munich, Germany.
The rocker was taken to a medical facility on Friday (21May10) after sustaining an injury during preparation for the band's world tour.
U2 is due to start the North American leg of its 360 Degree trek on 3 June (10), but it is not yet clear whether singer Bono will recover in time for the concerts.
A spokesperson for the band says, "Bono has today undergone emergency back surgery for an injury sustained during tour preparation training. He was admitted to a specialist neurosurgery 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."