Kate Ward
May 21, 2010 AT 03:40 PM EDT

U2 lead singer Bono had surgery on his back today in Munich while preparing for a world tour. “Bono has today undergone emergency back surgery for an injury sustained during tour preparation training,” his spokesperson told Reuters. “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.” The status of U2’s “360 Degree” world tour — which is supposed to kick off June 3 — will be addressed after Bono’s “condition has been assessed further.”

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