An image grab from an AFP TV video shows street-medics helping a "yellow vest" demonstrator (hidden) after he lost his hand during clashes outside the main parliament building in Paris, on February 9, 2019.
The protest in the French capital has passed the National Assembly and will end up near the Eiffel Tower.
The Associated Press said that paramedics were seen huddled around the injured protester, 30, near the gates of the National Assembly as they provided emergency treatment.
One witness who filmed the incident, 21-year-old Cyprien Royer, said it had been caused by a flash-ball grenade fired by police to disperse the crowd.
One protester, a photographer for the Yellow Vest demonstrations, had his right hand blown off by a police grenade.
The serious hand injury was sustained during violent clashes with cops on the streets of Paris today in the 13th consecutive week of demonstrations.
A total of 51,400 people took part in Saturday's protests, according to figures from the French Interior Ministry.
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"Every day the military. protects our compatriots from the risk of terrorism".
Despite a drop in numbers from the massive turnouts of the first demonstrations in November, tens of thousands still turned out in cities across the country to protest against French President Emmanuel Macron's policies. France's interior Christophe Castaner tweeted his indignation over the vehicle being set on fire saying,"These attacks are intolerable".
In Paris, 36 demonstrators were arrested.
But a YouGov poll of 1,037 people issued on Thursday suggested that almost two out of three people in France (64 per cent) still support the movement.
The activists waved Latvia's red-and-white flag, shouting slogans like "the French have woken up, while Latvians remain asleep".
He said more than 60 MPs have received threats or had homes or offices vandalised since the start of the revolt in November, an unprecedented number in post-war France.
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