Amazon HQ in Seattle. (GeekWire Photo / Kurt Schlosser)

New York and California’s attorneys general are joining forces with the Federal Trade Commission in its antitrust investigation of Amazon, according to Bloomberg’s Spencer Soper.

Though the FTC and California’s probes were previously disclosed, New York’s involvement and the inter-agency cooperation have not been reported. Under the agreement, California, New York, and the FTC will share findings and interview witnesses.

Amazon, Apple, Facebook, and Google are all under antitrust scrutiny by various government agencies. The chief executives of each company testified on marketplace dominance in tech during a Congressional hearing last week.

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