Target offers more guidance on data breach

Target continues to urge customers concerned about the theft of some 40 million credit and debit card account numbers from the retailer to watch their accounts closely but not to worry too much about the stolen data.

In social media posts and messages sent to customers, the retailer is emphasizing shoppers will have no liability for fraudulent charges.

The retailer has said there have not been many reports of fraud. But it won't say how many have occurred.

Target says there is no indication so far that card PIN numbers were stolen. So, that should prevent crooks from creating counterfeit cards and withdrawing cash from ATMs.

The company also says there's no indication that the stolen data included birth dates, social security numbers or the security codes on the back of cards. Those codes are typically required for online purchases.

Target says customers should be aware the retailer never asks for social security or PIN numbers.