FBI and MI5 leaders give unprecedented joint warning on Chinese spying

Christopher Wray joins Ken McCallum in London, calling Beijing the biggest long-term threat to economic security'

The head of the FBI and the leader of Britain's domestic intelligence agency have delivered an unprecedented joint address raising fresh alarm about the Chinese government, warning business leaders that Beijing is determined to steal their technology for competitive gain.

In a speech at MI5's London headquarters intended as a show of western solidarity, Christopher Wray, the FBI director, stood alongside the MI5 director general, Ken McCallum. Wray reaffirmed longstanding concerns about economic espionage and hacking operations by China, as well as the Chinese government's efforts to stifle dissent abroad.