Hong Kong (CNN Business) The head of Alibaba's video streaming platform has been arrested in China on suspicion of accepting improper payments, the e-commerce company says.

Yang Weidong is now under police investigation and has been removed from his position as president of the video site Youku, according to a statement Alibaba ( BABA ) filed with the US Securities and Exchange Commission on Tuesday.

"Alibaba Group is committed to the highest standards of business conduct," the statement said. "We do not tolerate any form of unethical or unlawful conduct."

CNN wasn't immediately able to reach Yang for comment.

Yang Weidong speaking in Beijing in June.

The Alibaba statement didn't provide any details on what Yang, who was arrested Monday, is alleged to have done. An Alibaba spokeswoman declined to comment beyond the company's SEC filing.