Investigators in the U.S. are set to expand their antitrust probe to Amazon’s cloud business – AWS, Bloomberg News reported. The Federal Trade Commission was already investigating the firm’s retail business.

Investigators at the U.S. Federal Trade Commission have been asking software companies recently about practices around Amazon’s cloud unit, known as Amazon Web Services, said the people, who declined to be named because they weren’t authorized to speak publicly. The outreach by the FTC signals that the agency, which is already looking at Amazon’s conduct in its vast online retail business, is taking a broader look at the company to determine whether it could be violating antitrust laws and harming competition. The FTC and Amazon declined to comment. The agency’s scrutiny won’t necessarily result in an enforcement action against the company. AWS dominates the market for foundational cloud-computing technology that provides the storage and computing power needed to run applications. It is several times bigger than its next largest rival, Microsoft Corp.’s Azure, according to analyst estimates. Gartner Inc. puts AWS’s share at 48% and Microsoft’s at 16%.