NEW YORK (CBSNewYork/AP) – Joan Rivers was rushed to Mount Sinai Hospital Thursday morning, after she went into cardiac arrest while undergoing a throat procedure at a clinic on the Upper East Side.

As CBS 2’s Don Champion reported, Rivers, 81, was rushed to the hospital around 9:30 a.m. after she stopped breathing during the procedure on her vocal cords at the Yorkville Endoscopy Clinic.

Sources said emergency medical technicians, firefighters, and medical staff at the clinic revived Rivers, 1010 WINS’ Juliet Papa reported.

Sources close to Rivers told “Entertainment Tonight” that Rivers was in a medically-induced coma Thursday night, and was under a 48-hour watch.

Her daughter, Melissa Rivers, released a statement Thursday night that reads, “I want to thank everyone for the overwhelming love and support for my mother. She is resting comfortably and is with our family. We ask that you continue to keep her in your thoughts and prayers.”

“This morning, Joan Rivers was taken to The Mount Sinai Hospital in New York, where she is being attended to. Her family wants to thank everybody for their outpouring of love and support. We will provide an update on her condition as it becomes available,” hospital spokesman Sid Dinsay said.

CBS 2 reported Rivers was in critical, but stable, condition.

Rivers’ representatives didn’t immediately respond to requests for comment.

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Joan Rivers In Medically-Induced Coma After Going Into Cardiac Arrest