Police could not confirm French media reports that the hand of the demonstrator, who is now being treated in the hospital, was blown up by a grenade used to disperse unruly crowds.
In Paris, where 5,000 gathered, two police vehicles were set alight near the Eiffel Tower and a demonstrator lost four fingers trying to enter the National Assembly, France's parliament.
An injured policeman in riot gear is given help during a demonstration by the yellow vests in Paris on February 9, 2019.
'Graffiti was being scrawled on the statues and walls around the parliament building, but nobody got over the railings.' Police responded with baton charges and tear gas around the Champs Elysee after demonstrators threw stones at officers and vandals tried to smash shop windows.
"I'm sorry that Macron lived this as a bit lese-majeste", Di Maio said.
"It goes back to the fact that there are some profits but they're always to the same people".
"And you cannot just say "let's go on with austerity because it's the only thing we can do".
"We have to win to have more social and fiscal justice in this country", said Mairesse, who was carrying a placard calling for the reimposition of a wealth tax on high earners repealed by Macron.
The French President was eventually forced to abandon the charge in a bid to quell the violence but ended up only firing up protestors keen on getting more concessions from the Government.
Thousands of protesters turned out in other parts of France, including the port cities of Marseille and Montpellier and also in Bordeaux and Toulouse in the southwest.
Some 51,400 people joined the Saturday's demonstrations across the country, 4,000 of them in Paris, according to French government figures. That was down from the previous week, when official figures put the number at 58,600, 10,500 in the capital city.
Politicians came together to condemn the arson attack on the home of Richard Ferrand, a close ally of Mr Macron, in Motreff, Brittany.