A cyber attack uncovered by Google appears to have been aimed at a large number of government officials and journalists, mainly but not exclusively in the United States, and to have originated in China.

Security correspondent Gordon Corera reports on the "offence and defence" of cyber security.

And Lt General Harry Raduege chairs the Deloitte Centre for Cyber Innovation in Washington DC, and who has written reports on cyber security, analyses the threat of further attacks.

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