LOS ANGELES (AP) — A University of Southern California graduate student who police say is a serial sexual predator has been charged with drugging and raping multiple women as investigators look for additional victims, Los Angeles authorities said.

Sizhe Weng, a 30-year-old Chinese national also known as Steven Weng, was arrested on Aug. 28, though the district attorney and police just released statements about the case on Wednesday.

Weng has pleaded not guilty to eight felony counts including forcible rape and sodomy by controlled substance or anesthesia, according to the LA County District Attorney’s Office.

Weng was held without bail and could not be reached for comment. A lawyer for him could not be found and the LA Public Defender’s Office didn’t immediately respond to an email aski

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