Retailer Neiman Marcus Group said it had notified about 4.6 million online customers that their personal information including names, contact information, and credit card numbers may have been accessed in a data hack.

The high-end department store chain said it had notified law enforcement authorities about the breach, which it said happened in May 2020.

About 3.1 million payment and virtual gift cards were affected, more than 85% of which were expired or invalid, Neiman Marcus said.

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