James Murdoch, without naming News Corp or Fox News, said some US media outlets were responsible for unleashing "insidious and uncontrollable forces" that will be present for years.
Mr Murdoch said news outlets had amplified disinformation about the November US elections and as a result, a large percentage of Americans now believe the falsehoods.
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Timothy Moore writes on equities, commodities and monetary policy. He writes Before the Bell and contributes to the Markets Live blog. Connect with Timothy on Twitter. Email Timothy at timothy.moore@afr.com