Amazon (NASDAQ: AMZN) has reported that some of its customers’ email addresses and names have been exposed in a data leak. The data leak reportedly occurred because of a “technical error.” Amazon informed customers of the issue in an email with the subject line: “Important Information about your Account.”

Amazon said in the email: “We’re contacting you to let you know that our website inadvertently disclosed your email address due to a technical error. The issue has been fixed. This is not a result of anything you have done, and there is no need for you to change your password or take any other action.”

A representative for Amazon said, “We have fixed the issue and informed customers who may have been impacted.” The company said it was not a breach of Amazon’s website or systems. In response to a request for specifics, the representative said the company had “nothing to add beyond our statement.”

The company did not explain how or where the information became visible. The cause, scale and circumstances of the error have not been disclosed. The company also did not release an estimate of the number of customers affected by the breach.

Security experts accused the company of withholding information. It’s also unclear whether it has any plans to contact any government regulatory bodies. Amazon is required to inform the Washington state attorney general of data incidents involving 500 state residents or more.

The issue could scare users away from Amazon during one of the most important weekends for the retail industry. Consumers spend billions during the four days of the Thanksgiving weekend and Amazon is expected to capture a large amount of that spending as one of America’s biggest retailers.