Gordon Corera
Security correspondent, BBC News
@gordoncoreraon Twitter

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The international vaccine supply chain has been targeted by cyber-espionage, according to IBM.

The company says it tracked a campaign aimed at the delivery "cold chain" used to keep vaccines at the right temperature during transportation.

The attackers' identity is unclear – but IBM said the sophistication of their methods indicated a nation state.

It follows warnings from governments – including the UK's – of countries targeting aspects of vaccine research.