U2 have spoken of their dismay after a rough-cut of their new album went missing during a photo shoot in France.
The CD belonged to U2 member Edge (l)
The Irish rockers called in police after the CD, containing songs from their forthcoming album, disappeared.
They fear the songs may turn up on the internet where they could be downloaded illegally, months before the release.
Guitarist Edge said: "A large slice of two years' work lifted. It doesn't seem credible but that's what's just happened to us... and it was my CD."
The album, which has not yet been named, is due for release in November. It will be the first new studio album from U2 since All That You Can't Leave Behind nearly four years ago.
The CD went missing in Nice where the band were being photographed for the album cover.
U2's management and record companies have expressed their concern at the possible theft.
"The recording of this album has been going so well," said Paul McGuinness of Principle Management.
"The band is so excited about its release. It would be a shame if unfinished work fell into the wrong hands."
Lucian Grainge, chairman of the Universal Music Group UK, said it was of "great concern".
"As the missing CD is our property, we're very keen to find it as soon as possible and the French Police are being extremely helpful in this regard," he said.