Bono has apologised after claims were made that workers at a charity he co-founded were subjected to a culture of bullying and abuse.

The U2 singer, 57, said he was left "furious" after the allegations surfaced in November last year.

He admitted the ONE organisation failed to protect some employees at its Johannesburg office and said: "I need to take some responsibility for that."

His comments came as the Mail on Sunday detailed a string of incidents, including allegations from a woman who says she was demoted after refusing to have sex with a Tanzanian MP.

"We are all deeply sorry. I hate bullying, can't stand it," he told the paper.