Alibaba said on its Weibo microblog that the media organization sought $300,000 to suppress a negative report about the company. Alibaba said the matter had been reported to police in Hangzhou, where the firm is based.

Alibaba's listing on the New York Stock Exchange could be one of the biggest initial public offerings ever. The company, founded by Jack Ma, is now looking at a September debut, a source told Reuters on Thursday.

(Reporting by Paul Carsten. Editing by David Clarke)