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Railway workers demonstrate on the tracks at the Gare de Lyon train station on Tuesday in Paris. A new round of strikes and demonstrations is planned against the unpopular pension reforms that, most notably, push the legal retirement age from 62 to 64.

Thomas Padilla/AP

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Railway workers demonstrate on the tracks at the Gare de Lyon train station on Tuesday in Paris. A new round of strikes and demonstrations is planned against the unpopular pension reforms that, most notably, push the legal retirement age from 62 to 64.

Thomas Padilla/AP

PARIS — Protests and strikes against unpopular pension reforms kicked off again Tuesday across France, with police security ramped up against feared violence and government warnings that radical demonstrators intend “to destroy, to injure and to kill.”

Fears that violence could mar the demonstrations prompted what Interior Minister Gérald Darmanin described as an unprecedented deployment of 13,000 officers, nearly half of them concentrated in the French capital.

Protests got underway peacefully Tuesday morning, with large crowds in multiple cities. In Paris, striking railway workers with burning flares and flags invaded and blocked train tracks serving one of the capital’s main stations, Gare de Lyon.

Police were braced for violence later in the day. The interior minister said more than 1,000 “radical” troublemakers, some from overseas, could latch on to marches planned in Paris and elsewhere.

“They come to destroy, to injure and to kill police officers and gendarmes. Their goals have nothing to do with the pension reform. Their goals are to destabilize our republican institutions and bring blood and fire down on France,” the minister said Monday in detailing the policing measures.

Striking railway workers demonstrate near burning palettes at the Gare de Lyon train station on Tuesday in Paris.

Thomas Padilla/AP

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Thomas Padilla/AP

Union leaders and political foes of President Emmanuel Macron blame his government for protest violence that has flared in recent weeks, saying his push to raise France’s legal retirement age from 62 to 64 sparked it.

Critics also allege that police officers used excessive force against protesters. A police oversight body is investigating multiple claims of wrongdoing by officers.

The striking railway workers at Gare de Lyon marched behind a banner that alleged: “The police mutilates. We don’t forgive!”

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Workers demonstrate with a poster referring the King Charles III’s canceled visit, on Tuesday in Nantes, western France.

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Workers demonstrate with a poster referring the King Charles III’s canceled visit, on Tuesday in Nantes, western France.

Jeremias Gonzalez/AP

The new wave of protests was the 10th time since January that unions have called on workers to walk out and for demonstrators to flood the nation’s streets against Macron’s proposal.

Unable to get a majority in parliament’s lower house for the unpopular reforms, Macron rammed them through using a special constitutional power, further inflaming protesters’ anger.

“Everybody is getting madder,” said Clément Saild, a train passenger at Gare de Lyon who said he supports the strikes despite their impact on transportation and other services.

“I am 26, and I wonder if I will ever retire,” he said.

Another passenger, Helene Cogan, 70, said: “French people are stubborn and things are getting out of hand.”