A Starwood booking database has been hit by a cyber attack, which came to light in September when security staff realised that unauthorised people had accessed and copied data since 2014.

The hack could affect half a billion people, including guests’ personal information and credit card data.

Marriott has warned that the hackers may have stolen the keys needed to access encrypted data, but says it is working with law enforcement on the investigation including within the EU, where breaches under GDPR could cost the company multi-millions in fines.

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