A targeted intelligence-gathering campaign by China-based hackers has resulted in the email account of Nicholas Burns, US Ambassador to China, being breached.

The hackers also accessed the accounts of the assistant Secretary of State for East Asia, Daniel Kritenbrink, and Commerce Secretary Gina Raimondo.

US Correspondent Dan Mitchinson told Jack Tame that these attacks seem to be happening almost weekly.

He said that the hackers managed to breach unclassified emails, but were not able to access anything with higher levels of security.

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