(Reuters) – The European Union is planning on filing formal antitrust charges against Amazon.com Inc (AMZN.O) over its treatment of third-party sellers, the Wall Street Journal reported on Thursday, citing people familiar with the matter.

The EU has been building its case and circulating a draft of the charge sheet for a couple of months and could officially file the charges as early as next week or the week after, the report here added.

Amazon did not immediately respond to a request for comment.