Rupert Murdoch's News Corp hacked in cyber attack believed to be linked to China

The company said in a regulatory filing it discovered the breach on 20 January and an investigation is under way "to determine its nature, scope, duration and impacts".

Customer and financial data have not been impacted, and News Corp's operations had not been interrupted.

In an email to staff, the company said the hack "affected a limited number" of email accounts and documents from News Corp headquarters, News Technology Services, Dow Jones, News UK, and the New York Post.

"Our preliminary analysis indicates that foreign government involvement may be associated with this activity and that some data was taken," the email said.