The CEOs of Supermicro and Amazon Web Services both called on Bloomberg to retract its story about Chinese spies hacking motherboards used by major American tech companies. “Bloomberg’s recent story had caused unwarranted confusion and concern for our customers, and has caused our customers, and us, harm,” Supermicro CEO Charles Liang wrote in a Monday statement. The Bloomberg report alleges that a Chinese military unit slipped modified microchips onto boards sold by Supermicro to companies like Apple and Amazon. Liang insisted that the company has not seen any “malicious hardware components in our products.” Amazon Web Services CEO Andy Jassy also claimed that Bloomberg “offered no proof” for its claims and said the outlet “showed no interest in our answers unless we could validate their theories.” “Reporters got played or took liberties. Bloomberg should retract,” Jassy wrote in a tweet Monday. Apple CEO Tim Cook also vehemently denied the report, telling BuzzFeed News there was “no truth” to the piece.