U2 was forced to leave the stage on Saturday night (September 1st) in Berlin, Germany after only five songs when Bono lost his voice, according to Rolling Stone. Fan footage clearly shows Bono not operating at the top of his game, with the singer telling the crowd after "It's A Beautiful Day" -- "I’m so sorry. . . I was ready to sing for you, but something has happened and I think we can’t go on. It’s not right for you. I’m sure this is not a big problem but I’m gonna have to do something." Bono called for a 10-minute break but the show was ultimately postponed.

Later that night, the band posted a message to fans on its official website, (U2.com):

Berlin
01 Sep 2018

We're so sorry for tonight's cancellation. Bono was in great form and great voice prior to the show and we were all looking forward to the second night in Berlin, but after a few songs, he suffered a complete loss of voice.

We don't know what has happened and we're taking medical advice. As always, we appreciate our audience's understanding and all our fans' support in Berlin and those who travelled from afar. We will update you very soon.

Adam, Larry and Edge

On Sunday (September 2nd), Bono posted:

Back On Song, Back To Berlin

I've seen a great doctor and with his care I’ll be back to full voice for the rest of the tour. So happy and relieved that anything serious has been ruled out. My relief is tempered by the knowledge that the Berlin audience were so inconvenienced. There was an amazing atmosphere in the house, it was going to be one of those unforgettable nights but not for this reason… We can’t wait to get back there on November 13th. - Bono

PS to the ones who sang 'Red Flag Day' for me last night thanks those are some high notes in that one. . . as always 'you take us higher'

U2's European leg of its Experience + Innocence tour rolls on Tuesday night (September 4th) in Cologne, Germany.