Victims of a major ransomware cyberattack that has spread through the US and Europe can no longer unlock their computers even if they pay the ransom.

The “Petya” ransomware has caused serious disruption at large firms including the advertising giant WPP, French construction materials company Saint-Gobain and Russian steel and oil firms Evraz and Rosneft.

Infected computers display a message demanding a Bitcoin ransom worth $300. Those who pay are asked to send confirmation of payment to an email address. However, that email address has been shut down by the email provider.

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