European regulators have been on an antitrust crusade in recent months, cracking down on American tech companies for their dealings overseas. Today, in the latest step in its continent-wide campaign, the European Commission announced an antitrust investigation into Amazon's e-book distribution deals.

The government entity announced the investigation in a press release, noting that the EC takes issue with certain clauses in Amazon's distribution agreements that require publishers to give Amazon terms that are as favorable as for any competitor.

"The Commission has concerns that such clauses may make it more difficult for other e-book distributors to compete with Amazon by developing new and innovative products and services," the release reads. "If confirmed, such behaviour could violate EU antitrust rules that prohibit abuses of a dominant market position and restrictive business practices."

In a statement, however, Margrethe Vestager, the EU Commissioner in charge of competitive practices, hastened to add that just because the EU has raised concerns doesn't mean Amazon is necessarily at fault. "Our investigation will show if such concerns are justified," the statement reads.

Of course, this is far from Amazon's only run-in with the EU's antitrust policies. The group is also investigating e-commerce practices across the continent, and whether e-commerce companies are making it difficult for consumers in Europe to make cross-border purchases. As one of the leading e-commerce companies in Europe, Amazon's operations will naturally be a key point of focus in that investigation. Meanwhile, the e-commerce giant has found itself at the wrong end of a tax-loophole investigation by the EU.

In a statement to WIRED regarding the most recent investigation, Amazon said, "Amazon is confident that our agreements with publishers are legal and in the best interests of readers. We look forward to demonstrating this to the Commission as we cooperate fully during this process.”

But while Amazon has its hands full with these investigations, the company is far from the only target of the EC's scrutiny. Just a few months ago, the group began investigating Google to determine whether its search results favor Google-owned products. And the tax deal investigations include companies ranging from Apple to Starbucks. All of it is an effort by Vestager, who took office in November, to monitor what some view as the uninhibited rise of American tech giants in Europe, which comes at the expense of European companies.

And yet, despite the fact that so many of the companies being investigated hail from the U.S., Vestager has denied that has anything to do with these inquiries. As she said in an interview with Bloomberg, “We’re not actually targeting U.S. companies—we don’t have a geographic bias. This just reflects that there are many strong companies in the U.S. that influence the digital market elsewhere.”