U.N. calls for proof of China's missing tennis star Peng Shuai's "whereabouts and well-being"

Geneva — The United Nations said on Friday it wants proof of the whereabouts of Chinese tennis star Peng Shuai, missing ever since she made sexual assault allegations against a former vice-premier. The U.N. Human Rights Office called for a fully-transparent investigation into the former Grand Slam doubles champion's claims against Zhang Gaoli.

"It would be important to have proof of her whereabouts and well-being and we would urge that there be an investigation with full transparency into her allegations of sexual assault," Liz Throssell, a spokeswoman for U.N. rights chief Michelle Bachelet's office, told reporters in Geneva.

"According to available information, Peng, a former world doubles number one, hasn't been heard from publicly since she alleged on social media that she had been sexually assaulted.