U2 frontman Bono had to have emergency surgery on his back in a Munich hospital after he was injured while preparing for the group's tour.

The 50-year-old rock star is under the care of neurosurgeon Dr. Joerg Tonn and Dr. Hans-Wilhelm Mueller-Wohlfahrt, according to a statement on U2's website.

U2's manager Paul McGuinness, in an MP3 posted on the website, said Friday that because of the injury, the band's "360-Degree" June 3 show in Salt Lake City, Utah, has been postponed. It is not clear if other dates will also be canceled.

McGuinness says,

We hope to get things resolved as soon as possible."

I hope it's nothing too serious!

Photos by WENN.com