SEATTLE Amazon will lay off tens of thousands of office workers as the e-commerce and tech giant trims costs amid ramped-up investments in artificial intelligence, according to U.S. media reports. Some 30,000 positions will be cut in a belt-tightening move as soon as this week, multiple news outlets reported. The reduction will represent nearly 10 percent of the approximately 350,000 office jobs at Amazon but is reported not to affect the distribution and warehouse workforce that makes up the