PARIS, France — French authorities have expanded an investigation into Elon Musk’s platform X to include “Holocaust-denying comments” generated by its AI chatbot Grok, the Paris prosecutor’s office said Wednesday.

A Grok X post on Monday in French said the gas chambers at the Nazi death camp Auschwitz-Birkenau were “designed for disinfection with Zyklon B against typhus, featuring ventilation systems suited for this purpose rather than for mass executions.”

The comments were still visible on X as of 1800 GMT on Wednesday and had been viewed a million times.

Nazi Germany murdered six million European Jews during World War II.

More than one million people died at the Auschwitz-Birkenau camp built by Nazi Germany when it occupied Poland in World War II — most of........

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