Target revealed this week updates on its investigation into a data breach, and as it turns out more people had information stolen than previously stated.

Approximately 70 million customers had information like addresses, phone numbers, credit and debit card numbers stolen from Black Friday through December 15, according to a company press release.

Previously the megastore reported 40 million shoppers were at risk back when the original announcement was made in December.

Target said it is going to try contacting every affected customer.

Additional tips can be found here on Target's website for those who shopped at Target during the holiday season.

"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, said in a statement this week. "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."

Customers will have "zero liability" for the cost of any fraudulent charges caused by the breach, according to Target.

Target has announced it'll offer one year of free credit card monitoring and identity theft protection to those who visited U.S. stores on Black Friday through when the breach was discovered.

Customers have three months to apply for the program.

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