Target, Neiman Marcus, and possibly three other major retailers suffered data breaches over the holiday season, exposing customer credit card data to potential theft and abuse. Today, Neiman Marcus CEO Karen Katz has published a letter apologizing for the breach, and offering a free year of credit monitoring service to any customer who shopped at Neiman Marcus with a payment card over the past year.

"We want you always to feel confident shopping at Neiman Marcus, and your trust in us is our absolute priority," said the chief executive.

In addition to the apology, the website has a number of updates on the ongoing investigation. While we still don't know the scale and scope of the data collected, Katz writes that PIN numbers, social security numbers, and birth dates were not compromised. While both credit and debit card information was collected, Neiman Marcus cards have apparently not been abused and the company believes that the breach didn't affect customers who shopped online.

Neiman Marcus also writes that there's no evidence that the breach is connected to the one at Target, which exposed up to 70 million customers' personal data. The company says it's working with the US Secret Service and federal law enforcement agencies, and is disabling the malware that caused breach as fast as the company can find it.