The national trade union General Confederation of Labor said that 3.5 million French citizens attended protests on Thursday, while officials estimated that 1.08 million people took to the streets, according to France 24. 

About 12,000 security forces were deployed to French streets, including 5,000 in Paris. 

Protesters clashed with police at times as the demonstrations turned violent, with several hundred protesters dressed in black smashing windows and street furniture, according to Agence France-Presse. Multiple convenience stores and a McDonald's were damaged in Paris. 

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Interior Minister Gerald Darmanin said that there were "many injured police officers." 

"These acts cannot go unpunished," Darmanin tweeted. 

The protests began in January when Macron, the 45-year-old centrist president in his second term, announced that his government would increase the retirement age from 62 to 64 years old to keep pensions funded. 

Anger intensified earlier this month after Macron said that he would pass the pension reform using a special constitutional power without a vote by the National Assembly. 

Macron said Wednesday that he wants the reform finalized by the end of the year and urged calm among protesters, referencing violent demonstrations in other Western countries. 

"When the United States of America lived what they lived at the Capitol, when Brazil lived what it lived, when you have seen extreme violence in Germany, the Netherlands, or sometimes here at home in the past... we must say that we do respect (peaceful protesters), we do listen, we’re trying to move the country forward," Macron said Wednesday. 

The Associated Press contributed to this report.