AstraZeneca says its China operations president under investigation

(Reuters) -- AstraZeneca's China president is under investigation and is cooperating with Chinese authorities, the company said on Wednesday, sending its shares down as much as 5.3% and making it the biggest loser on London's FTSE 100.

It was not immediately clear whether the executive, Leon Wang, was in the custody of the Chinese government. When asked about Wang's whereabouts, a company spokesperson only reiterated that the executive was under investigation.