Robin Gibb's wife and youngest son were at his hospital bedside on Monday as the Bee Gees singer remained in a coma, having contracting pneumonia in his battle against cancer.
Dwina Gibb and her son Robin-John were seen visiting the clinic in west London where the 62-year-old star is being treated.
"Sadly the reports are true that Robin has contracted pneumonia and is in a coma. We are all hoping and praying that he will pull through," said a brief statement on RobinGibb.com.
"This website is currently receiving an extraordinarily high volume of traffic and is temporarily unavailable. Sorry for any inconvenience."
Vsitors were directed to Gibb's Facebook page, where fans have been leaving messages of support by the minute.
Gibb had bowel surgery 18 months ago for an unrelated condition but a tumour was found and he was diagnosed with cancer of the colon and the liver.
The Bee Gees -- twins Robin and the late Maurice Gibb and their elder brother Barry -- are among the biggest-selling groups of all time.