An Amazon employee was fired after sharing customers’ email addresses with an unnamed third-party seller, in violation of company policies, Amazon said.

“The individual responsible for this incident has been terminated from their position, and we are supporting law enforcement in their prosecution,” an Amazon spokesperson said in a statement Friday.

Amazon said only email addresses were taken by the employee, not any other customer information. The company has already started emailing affected customers about the incident.

A third-party seller is a merchant that sells on Amazon’s website, though the company declined to provide additional information about this seller. It said the seller has been blocked from Amazon

The firing comes a few weeks after The Wall Street Journal reported on Amazon investigating alleged data leaks at the company, which included employees allegedly selling customers’ email addresses to sellers.

The report said the practice was more prevalent in China. It’s unclear whether the firing is directly connected to the previously reported investigations.