Paris authorities are investigating alleged anti-Semitic comments by Yellow Vest protesters in the city subway toward a woman whose father died at Auschwitz.
A journalist described the incident on Twitter on Saturday night, after a new round of Yellow Vest protests over taxes and other economic concerns.
The woman's nephew identified his aunt on Twitter as the target of the comments.
The Paris prosecutor's office said Monday that an investigation has been opened.
Some protesters in the Yellow Vest movement have expressed extreme or racist views.
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But research into its followers and their online comments has found that the movement as a whole is a broad-based grassroots phenomenon which includes people from broad sectors of society and as no single political bend.