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The family of former Bee Gee Robin Gibb is keeping vigil at the pop icon's bedside after he fell into a coma, according to reports.

The singer recently contracted pneumonia, landing him in a private hospital in London.

Gibb's health declined in 2010 when he had emergency surgery to treat a blocked bowel. Further surgery to treat a twisted bowel was also required.

Gibb's twin brother and band mate, Maurice, died nine years ago at the age of 53 years old from the condition.

Following the surgery, Robin Gibb was diagnosed with colon cancer, which spread to his liver. Last month he announced that he was in remission from the disease.

The British singer, who was raised in Australia, rose to pop fame as one third of the Bee Gees with his brothers Maurice and Barry.

The trio enjoyed a number of hits during their 45-year career, including "To Love Somebody," "Night Fever" and "Stayin' Alive."