Hackers made off with a whopping five million credit and debit card numbers from Saks Fifth Avenue, Saks Off 5th and Lord & Taylor, placing it “among the most significant credit card heists in modern history.”

Parent company Canada-based Hudson’s Bay Company announced the breach affecting the North American stores on Sunday, saying, “HBC has identified the issue, and has taken steps to contain it.”

HBC disclosed the hack after cybersecurity firm Gemini Advisory revealed that the JokerStash hacking group, aka Fin7, claimed to have five million stolen payment card numbers the group intends to sell on the dark web. The group responsible for this hack was also reportedly responsible for hacking “Whole Foods, Chipotle, Omni Hotels & Resorts, Trump Hotels and many more.”

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