Google has been hit by the 'worst ever' internet hijack in the company's history, security experts say.

Information from users' Google searches, cloud-hosting services and the company's bundle of collaboration tools for businesses - known as G Suite - were all affected.

Data belonging to users across the globe was intercepted by servers in Nigeria, China and Russia - including those run by major state-owned telecoms providers.

Security experts suggested the hack was a 'wargame experiment' - meaning it may prelude similar, more wide-scale attacks from the nations involved in future.