PARIS (AP) — Striking workers waving burning flares on Tuesday invaded and blocked train tracks serving one of Paris’ main railway stations, joining a new day of nationwide protests against unpopular pension reforms.

Dozens of railway workers with flags and flares marched along tracks outside Gare de Lyon. Peaceful marches were also getting underway in other cities, in the latest day of nationwide marches and strikes against President Emmanuel Macron’s push to raise France’s legal retirement age from 62 to 64.

THIS IS A BREAKING NEWS UPDATE. AP’s earlier story follows below.

PARIS (AP) — France's government unfurled ramped-up security measures and warnings that violent demonstrators intend “to destroy, to injure and to kill" as trade unions launched a new flurry of marches and strikes Tuesday against pension reforms that have triggered an intense months-long firestorm of protest.

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

He said that more than 1,000 “radical" troublemakers, some from overseas, could latch on to planned peaceful marches in Paris and other cities.

“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.

Union leaders and political foes of President Emmanuel Macron blame his government for protest violence that has flared in recent weeks, saying his pension reforms are sparking it. Critics also allege that police officers are using excessive force against protesters. A police oversight body is investigating multiple claims of wrongdoing by officers.

The new wave of strikes and protests was the 10th time since January that unions have called on workers to walk out and for demonstrators to flood the streets against Macron's push to move back France's legal retirement age from 62 to 64.

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.