French police have fired tear gas and water cannons to disperse violent demonstrators in Paris as thousands gathered to vent anger against rising fuel taxes.
Thousands of police have been deployed nationwide to contain the eighth day of deadly demonstrations.
The rallies began as protests against tax but morphed into a rebuke of President Emmanuel Macron and the perceived elitism of France's ruling class.
Two people have been killed since November 17 in protest-related tragedies.
Tense clashes on the Champs-Elysees in Paris on Saturday saw police face off with demonstrators who burned plywood, wielded placards reading "Death to Taxes" and upturned a large vehicle.
At least 20 people, including four police officers, were injured in the day of unrest in Paris, according to police.
One person sustained a serious hand injury.
Police said dozens of protesters were detained for throwing projectiles, among other acts.
In the city's Place de la Madeleine, scooters were burned to blackened shells.
"It's going to trigger a civil war and me, like most other citizens, we're all ready," said Benjamin Vrignaud, a 21-year-old protester from Chartres.
"They take everything from us. They steal everything from us," said 21-year-old Laura Cordonnier.
The famed avenue was speckled with plumes of smoke and neon - owing to the colour of the vests the self-styled "yellow jacket" protesters don.
French drivers are required to keep neon security vests in their vehicles.
Le Pen accused of encouraging protests
Authorities said 5000 protesters flooded the Champs-Elysees at the demonstration's peak but that number had dwindled by dusk. There were nearly 81,000 protesters in total nationwide.
Interior Minister Christophe Castaner denounced protesters from the far-right whom he called "rebellious", as he accused National Assembly leader Marine Le Pen of encouraging them.
But the Interior Ministry played down the scale of Saturday's demonstrations by highlighting that up to 244,000 people took part in last Saturday's protest.
Authorities noted that no banks or boutique windows were targeted, unlike the violent May Day demonstrations earlier this year.
The unrest is proving a major challenge for embattled Macron, who's suffering in the polls.
The leader, who swept to power only last year, is the focus of rage for the demonstrators, who accuse the pro-business centrist of elitism and indifference to the struggles of ordinary French.
Macron has so far held strong and insisted the fuel tax rises are a necessary pain to reduce France's dependence on fossil fuels and fund renewable energy investments - a cornerstone of his reforms of the nation.
He will defend fresh plans to make the "energy transition" easier next week.