Reports: Joan Rivers In Critical Condition
Comedian Joan Rivers has been taken to hospital after complications during surgery, according to the TV network she works for.
The 81-year-old US star stopped breathing while undergoing an operation on her throat, reported the news website of entertainment channel E!.
Mount Sinai Hospital in New York City confirmed Rivers was being treated there but gave no details on her condition, saying it would provide an update when it was available.
Hospital spokesman Sid Dinsay said: "Her family wants to thank everybody for their outpouring of love and support."
Her daughter and regular co-star in some of her TV shows Melissa Rivers and her son Cooper have flown to be by her side, the network added in a statement.
A spokesman for the New York Police Department said: "An 81-year-old is in a critical condition at Mount Sinai Hospital."
He said the emergency call related to the incident was made at 9.39am local time from an address in East 93rd Street, Yorkville.
The address houses an outpatient centre which describes its task is to "serve as a community resource for digestive disorders".
New York City Fire Department spokesman Jim Long told Reuters that the patient taken from Yorkville Endoscopy to Mount Sinai Hospital by emergency workers was reported to have been in cardiac arrest at the time.
The police spokesman said he was unable to confirm that Ms Rivers heart had stopped.
There has been no word from her publicist as yet but Ken Baker, an entertainment journalist at E! News, said on his Twitter account that Rivers was in stable condition at Mount Sinai Hospital.
The day before, Rivers had attended an event to promote her latest book.
Just six days ago he had also been filmed taking part in the Ice Bucket Challenge, during which she had a bucket of iced water poured over her after being challenged by Anne Hathaway, Sarah Jessica Parker, and Tara Reid.
Rivers is host of E!'s Fashion Police and also appears in an internet talk show on YouTube with Melissa called In Bed With Joan.
Earlier this year she finished shooting her fourth series of another show with her daughter called Joan And Melissa: Joan Knows Best?
After starting on The Tonight Show with Johnny Carson she went on to host a rival programme called The Late Show in the 1980s before setting up the daytime The Joan Rivers Show a few years after.
According to her website she is due to embark on a UK tour called Before They Close The Lid, starting in Oxford on October 10, which will go to 13 venues around the country.
Before that she was billed to appear at a number of charity and stand up events around the US.