Investitech

It’s Friday the 13th. And the U.S. investigatory knives have come out for Big Tech in the U.S. House of Representatives.

As The New York Times reports, a House committee investigating Amazon, Apple, Facebook and Google over possible antitrust violations today sent the four companies detailed requests for documents, emails and other communications.

According to the report, investigators are seeking information on the companies’ businesses, acquisitions and conduct in digital markets including internet search, advertising and e-commerce.

The Times report suggests the House documents indicate congressional staff have “done considerable homework on the companies under scrutiny,” with one request to Google naming 14 senior executives and asking for their communications on a series of company moves that included Google’s purchase of DoubleClick in 2008 and AdMob in 2011.

Similarly, with Facebook, the House is asking for extensive internal information about its acquisitions of Instagram in 2012 and WhatsApp in 2014. Both companies were, at the time of their acquisition, “potentially emerging competitors” until Facebook bought them.

The House inquiry joins several other investigations into big tech, including the Justice Department and the Federal Trade Commission.