Joan Rivers in Critical condition;Stopped breathing during surgery

Fashion police host Joan Rivers is said to presently be in a critical condition after her heart stopped during a surgical procedure

 According to reports, at some point, Joan's heart stopped beating. It's unclear if doctors were able to restart the comic's heart. 

TMZ reports that an emergency call was placed to 911 at 9:39 AM ET and the caller said, "We have somebody in either cardiac or respiratory arrest." 

Rivers was said to be undergoing a throat procedure in a clinic (specifically on her vocal chords) ... when she stopped breathing during the surgery. 

81-year-old Rivers was rushed to Mount Sinai hospital in New York. Daughter Melissa is said to be on her way to New York to be by her mother's side..