In September, a bank information website claimed European financial institutions weren’t prepared to fend off cyber attackers.

This warning came after several U.S. banks experienced web blackouts and delays due to online hackers in October. Though the incidents didn’t cause any major damage, they also failed to push other international banks to take precautionary steps or measures.

And now, Eurozone bankers are likely regretting their dismissive attitudes; hackers recently stole more than €36 million from banks across Europe, according to the Financial Times.

It says upwards of 30,000 online customers “were affected by the attack, which security companies have called Eurograbber.”

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