"Bono has today undergone emergency back surgery for an injury sustained during tour preparation training," reads the message on U2.com. "He was admitted to a specialist neurosurgery unit in a Munich hospital, and is under the care of neurosurgeon Prof. Dr. Jorg Tonn and Dr. Muller Wohlfahrt. Bono will spend the next few days there, before returning home to recuperate."
It's unclear how the band’s tour will be affected by Bono's injury. "Once his condition has been assessed further, a statement will be made regarding the impact on forthcoming tour dates," says the message.
U2 is scheduled to perform in Salt Lake City, Utah, on June 3 as part of their 360 Tour, then continue performing in North American before heading back to Europe in August for more shows.