MUNICH, Germany - U2 frontman Bono has undergone emergency back surgery.

A statement posted on the band's website said the singer was admitted to a specialist neurosurgery unit in a Munich hospital.

He is expected to spend the next few days there before returning home to recuperate.

A statement regarding upcoming tour dates is expected shortly.

The band's June 3 concert in Salt Lake City, Utah, has been postponed.

U2 is due to play Edmonton on June 23, Toronto July 3 and Montreal July 16-17.