Irish rocker Bono has undergone emergency back surgery for an injury he sustained during tour preparation training, his band U2's Web site said Friday.

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The online message explained the musician was admitted to a specialist neurosurgery unit in a Munich hospital where he is expected to spend a few days before returning home to recuperate.

Live Nation has confirmed U2's tour, which is scheduled to start June 3 in Salt Lake City, has been postponed.

Fans with tickets to the opening event are encouraged to retain them until updated show information can be provided, the Web site said.