The New York clinic where Joan Rivers was having a procedure done when she went into cardiac arrest says its been receiving death threats from fans of the late comedian who blame them for her death.

Rivers was undergoing an outpatient procedure on her vocal cords when she suddenly stopped breathing. Yorkville Endoscopy says they've been receiving tons of threats which they're taking very seriously. As a precaution, they've hired additional security and have been sending employees home early. In addition to the threats, the clinic is also under scrutiny of New York State health officials who are considering launching a full-scale investigation.