London police say convicted serial rapist Zhenhao Zou may have targeted over 50 other women, and almost two dozen have come forward already.

Zhenhao Zou, 28, was convicted of raping women in the U.K. and China after police uncovered a date-rape drug and hundreds of secret videos in his London home.

Twenty-three more women have come forward to the police with allegations against serial rapist Zhenhao Zou - a Chinese PhD student found guilty in London last month of drugging and raping 10 women across two continents.