Paris, France – France is counting the cost of a day of unrest after hundreds of thousands of people took to the streets nationwide, in the largest mobilisation since protests over education reforms and the cost of living began last month.

At Place de la Republique, in the heart of the French capital, people on Sunday surveyed the previous day’s destruction in dismay: smashed windows, gutted buildings, looted shops.

“I find it unacceptable – absolutely unacceptable,” said Rabah, who has been living in Paris for more than 70 years. “Back in the day, we also demonstrated, but peacefully,” he said.

Staring at the burned skeleton of what used to be a newspaper stand, 56-year-old Claire was also shaken. “I love Paris so much, and seeing it like this makes me furious,” she said. “It’s absolutely appalling. I’m actually quite overcome with emotion.”

Nearby, the statue of Marianne, the symbol of the French Republic, was covered in graffiti. “Those who sow misery reap anger,” read one inscription.

A pedestrian walks past a damaged front window of a shop, in central Paris [AFP]

The student-led protests began in mid-September, caused by grievances ranging from overcrowded classrooms and teacher shortages to systemic inequality and a lack of opportunity.

The movement quickly spilled out of the schoolyards and into the streets, tapping into broader social and economic anxieties.

On Saturday, these complaints converged in a mobilisation that saw a nationwide turnout of 550,000 people, according to authorities; unions and organisers put the estimate at 800,000.

But while the vast majority of demonstrators rallied peacefully, the scale of the violent unrest threatened to eclipse their message. In Paris, there was also heavy use of tear gas and stun grenades by the police, including before the start of the march, which set the tone for a tense day.

“I marched from the 10th arrondissement town hall to Place de Clichy. I was there from start to finish, and it was very peaceful – just all kinds of people, all of them nonviolent,” said Stephanie, a 23-year-old Parisian student.

“But once again, the violence was so spectacular that the actual message – the reasons behind the protesters’ grievances – was never conveyed,” she said.

Macron to address nation

French President Emmanuel Macron, whose second and final term ends next year, will give a televised address to the nation at 18:00 GMT on Sunday after meeting government ministers, his office announced.

Interior Minister Laurent Nunez said nearly 1,800 people had been arrested – almost half of them in Paris – and more than 500 police officers, gendarmes and firefighters had been injured in the unrest.

“Protesting is a fundamental right. Causing disorder through violence and in a concerted manner is not,” he said on Sunday.

During Saturday’s protest in Paris, Al Jazeera saw groups of black-clad, masked young men smashing shop windows with what appeared to be golf clubs before fleeing with bags of stolen goods.

In Marseille, France’s second-largest city, dozens of shops were looted and a group of people broke into the city hall before being forced out.

“Students and others have real claims they want to air which no one is listening to now because idiots are smashing everything,” said Benoit Payan, the city’s mayor.

In Limoges, footage showed flames engulfing the city hall as the fire spread through the historic building. Public buildings were also damaged in Bordeaux and other cities.

A protester holds a rock during the demonstration near Place de la Republique in Paris [Carl Court/Getty Images]

Police conduct has also come under scrutiny. France’s police inspectorate, the IGPN, had opened 36 investigations into alleged police violence since the high-school protests began, according to figures released by the Ministry of the Interior on October 13. The figure predates Saturday’s demonstrations.

Human rights lawyers have described some of their clients’ injuries as comparable to those seen in conflict zones. These include a minor who has lost his hand, another with his jaw smashed and a third pupil who lost sight in one eye.

“There is an increasingly systematic use of crowd-control measures that would normally be reserved for much more serious situations,” said Christophe Calvao, president of the Paris Young Lawyers’ Union. “This only serves to inflame tensions and make people even angrier.”

The government now faces the challenge of responding to widespread social discontent while trying to pass a budget aimed at bringing France’s public finances under control.

Prime Minister Sebastien Lecornu wants to reduce the country’s deficit through spending restraint and tax measures – a move that will likely deepen public anger. Cuts to France’s generous welfare system have traditionally faced strong public resistance.

All of this takes place in a highly toxic political environment as parties harden their positions ahead of next year’s presidential election.

Jean-Luc Melenchon, the leader of the left-wing France Unbowed party and potential presidential contender who has sought to appeal to young voters, accused the government of fuelling the unrest.

“In Paris, aberrant leadership has opened the door to chaos. Those in charge no longer know what to do; the rank and file are afraid and are running wild,” he said.

Lecornu hit back. “This is YOUR political responsibility,” said the prime minister on social media, accusing far-left groups of orchestrating the violence.