Neiman Marcus confirmed Friday it suffered a security breach in mid-December that wasn't detected until January.
The Dallas-based luxury retailer said its database of customer information was hacked in December.
Neiman Marcus did not say how many people may have been affected or what information was lost, only that credit card data may have been compromised for in-store shoppers.
The Neiman's security breach appears to have occurred at the same time Target was hacked.
Neiman Marcus said it is investigating and working with federal authorities.
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