Alibaba's shares fall in Hong Kong following unconfirmed rumors linking Jack Ma to probe Alibaba's Hong Kong-listed shares fell Tuesday after unconfirmed rumors linked the internet tech giant's founder Jack Ma to a national security investigation. Alibaba headquarters in Hangzhou, China. Bloomberg | Bloomberg | Getty Images Alibaba's Hong Kong-listed shares closed about 1.7% lower Tuesday — after earlier falling more than 9% —following unconfirmed rumors that linked the company's founder Jack Ma to a national security investigation. Chinese state media reported earlier in the morning that the Hangzhou security bureau on April 25 took "criminal coercive measures" on an…