Cyber attacks pose a bigger threat to our existence than nuclear weapons, American business magnate Warren Buffett has warned at an annual shareholder's conference.

'I don't know that much about cyber, but I do think that's the number one problem with mankind', he said.

Last year the billionaire businessman warned that no company could be prepared for the threat presented by a major cyber, biological, reaper ip booter pastebin nuclear or chemical attack.

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Billionaire Warren Buffett (pictured) said he was 'pessimistic on weapons of mass destruction generally' but was even more concerned about cyber attacks