Gibb, 53, who lives in Miami Beach, was being treated in an intensive care unit after the operation, Mount Sinai Medical Center spokeswoman Kathleen Dorkowski said.

Gibb was admitted to the hospital Wednesday with abdominal problems, she said.

“Prior to undergoing emergency abdominal surgery, on Thursday, January 9, Mr. Gibb experienced cardiac arrest,” Dorkowski said in a statement late Friday. “He remains in critical but stable condition.”

In a telephone interview, she said the hospital, at the request of the family and physicians, would release no other information on the cardiac arrest or other aspects of Gibbs’ condition or treatment.

“Maurice has undergone surgery for an intestinal blockage. He is in a critical condition in intensive care. We are awaiting a full medical prognosis … but everyone is very, very worried,” a spokesman for his twin, Robin, said in a statement.

Maurice plays bass and keyboard for the group, whose name is short for the Brothers Gibb.

The Bee Gees – Maurice, Robin and their older brother Barry – have lived in South Florida since the late 1970s. Their younger brother, Andy, who had a successful solo career, died in 1988 at age 30 from a heart ailment.

Known for their close harmonies and original sound, the Bee Gees are members of the Rock and Roll Hall of Fame, and their 1977 contributions to the Saturday Night Fever album made it the best selling movie soundtrack ever. Among their disco hits on that album are “Stayin’ Alive,” “More Than a Woman” and “How Deep Is Your Love.”

The hospital set up an information hotline recording, (305) 674-2600, for fans interested in Maurice Gibbs’ condition.