AB Acquisition LLC, an Idaho-based company that owns and operates several supermarket chains, reported that customers' credit and debit card data may have been compromised in a data breach that started June 22 at the earliest and ended by July 17.

Officials said that someone had gained illegal access to the computer systems at Supervalu Inc., the former owner of many of the chains involved. Eden Prairie, Minn.-based Supervalu, which continues to serve as AB Acquisition's third-party IT services provider, confirmed the breach.

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