U.S. antitrust regulators are preparing to launch an investigation into Apple’s decision to effectively bar AdMob from its iOS devices. The Financial Times, citing people familiar with the matter, reports that it’s currently unclear whether the Federal Trade Commission or the Justice Department will handle the investigation. Apple recently changed its iOS developer terms to forbid the sharing of user information with “an advertising service provider owned by or affiliated with a developer or distributor of mobile devices, mobile operating systems or development environments other than Apple,” effectively barring AdMob from all iOS applications. Notably, the company also added language that bars third-party analytics services. Apple is already facing antitrust scrutiny from the Justice Department in relation to its digital music business and its blocking of Flash software from its iOS devices.