The additional data is not part of a new breach, but was uncovered as part of an ongoing investigation into the original incident that occurred right in the midst of the holiday shopping season.
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"I know that it is frustrating for our guests to learn that this information was taken and we are truly sorry they are having to endure this," said Gregg Steinhafel, chairman, president and chief executive officer, Target. "I also want our guests to know that understanding and sharing the facts related to this incident is important to me and the entire Target team."
Target reiterated that its customers will not be liable for any fraudulent charges arising from the breach. In addition, Target is offering affected customers one year of free credit monitoring and identity theft protection.
The retail chain also lowered its sales forecast as a result of the data breach. Target says it expects a sales decline of 2 percent to 6 percent due to "meaningfully weaker-than-expected sales since the announcement."