(Bloomberg) -- The hack on Yahoo! Inc. that compromised the personal data of at least 500 million users is raising “serious questions” among European Union privacy regulators.

The “vast number of people affected by this cyber-attack is staggering and demonstrates just how severe the consequences of a security hack can be,” U.K. Information Commissioner Elizabeth Denham said in a statement Friday. Like their U.K. neighbors, Irish data protection regulators said they have asked Yahoo “a number of issues for which we are seeking further information and clarification.”

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