Around 410,000 people took part in demonstrations across France, according to the interior ministry, while the CGT trade union put the nationwide turnout at 800,000, as clashes with police, looting and vandalism were reported in several cities.
The Loire-Atlantique prefecture reported on Saturday that shops were being looted in Nantes, and said six people had been arrested.
In Grenoble, the Isere prefecture said around 400 masked individuals dressed in black bloc attire were causing damage and had attacked police with mortars and projectiles. Police were attempting to apprehend those involved and restore order.
The demonstration in Grenoble was organised by the CGT trade union and the Yellow Vest movement, according to the prefecture.
In Bordeaux, the Gironde prefecture said “hostile groups” were targeting security forces, throwing projectiles and setting up barricades at Place de la Bourse. It urged residents to avoid the area.
In Lille, projectiles were thrown at riot police as tensions escalated, according to journalists reporting from the scene. Police used water cannons against demonstrators.
The Nord prefecture estimated that 15,000 people had joined the demonstration in Lille and called on participants to leave the area peacefully.
Authorities reported 30 arrests in the Nord department by 1300 GMT, including 25 in Lille.
Police also seized numerous weapons, including hunting knives, butterfly knives and airsoft guns.
Curfews for unaccompanied minors in designated areas of Lille, Denain, Douai and Wattignies were extended until Monday morning and expanded to parts of Marly and Valenciennes.
The measures run from 1800 GMT to 0400 GMT and apply from Friday evening through Monday morning, according to a prefectural order published Friday.
In Nice, the Alpes-Maritimes prefecture said 40 people had been arrested by 1430 GMT.
In Paris, the police prefecture estimated that 110,000 people had joined the demonstration, matching the figure reported for the previous week.
Police later used water cannons against demonstrators in the capital. Individuals also vandalised the windows of a car dealership on Cours de Vincennes.
Authorities reported that more than 3,000 checks had been carried out in Paris and 65 people had been arrested. Trade union turnout figures for the demonstrations in Paris and Lille were not yet available.
In Marseille, tensions rose during a confrontation between police and demonstrators, with officers using tear gas. Firefighters also extinguished a fire near the march, according to local media.
Police used tear gas as a demonstration moved toward Place de la Republique in Rennes, while the Rhone prefecture estimated that 10,000 people had gathered in Lyon.
In Lyon, the prefecture reported 29 arrests by 1600 GMT, including people suspected of weapons and drug possession and participation in an unlawful gathering, according to local newspaper Le Progres.
No demonstrations had been authorised in the city.
In Chambery, clashes broke out between police and groups described by the Savoie prefecture as violent, as demonstrators blocked the city's urban motorway.
In Orleans, where the National Rally (RN) was holding its congress, the mayor announced 12 arrests following the day's demonstrations.
The city hall separately reported three arrests linked to the demonstration against the RN and 10 arrests outside the urban area.
