In the French capital, Students were caught in an angry face off with riot police, who fired tear gas in response.
Officers in Nantes also fired tear gas and water cannons at protestors in more furious scenes.
Services have ground to a halt across the country.
Teachers, train conductors and airline controllers walked off the job across France on Thursday, disrupting transport and public services in a test of public anger with President Emmanuel Macron’s reform drive.
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