The Paris prosecutor's office has opened an investigation into the cyberattacks of two third-party payment operators, Viamedis and Almerys, which could constitute one of the most massive data leaks observed in France, he said on Friday.
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The investigations follow complaints from the two service providers, said the prosecution.
More than 33 million French people are affected by this attack, according to the National Commission for Information Technology and Liberties (Cnil).