US retailers have become vitims of data breaches after hackers gained access to the database of Target, a US retailer, stealing details of up to 110 million customers.
The stolen information included details of customers' credit card numbers, names, mailing addresses and phone numbers.
Target said it will offer customers one year of free credit monitoring and identity theft protection.
In a statement, president and CEO Gregg Steinhafel said: "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."
"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," Steinhafel said.
The retailer added that its customers would have 'zero liability' cost of any fraudulent charges arising from the breach.
Meanwhile, Neiman Marcus has been notifying customers of a data breach after hackers stole card details from an undisclosed number of shoppers.
The US retailer said it was working with the US Secret Service to investigate the theft.
Neiman Marcus said in an emailed statement: "On January 1st, the forensics firm discovered evidence that the company was the victim of a criminal cyber-security intrusion and that some customers cards were possibly compromised as a result."