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 US media reports.

Some 30,000 positions will be cut in a belt-tightening move expected to begin on Tuesday, 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 majority of the company's more than 1.5 million employees.

Seattle-based Amazon did not reply to AFP queries regarding the planned cuts reported by the Wall Street Journal, New York Times and other outlets citing anonymous sources.

Amazon shares ended the formal trading day up slightly as word of th

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