This initially peaceful May Day demonstration spilled over into protests against pension reform.
The police, in turn, drive away especially active protesters with tear gas.
In Paris, policemen who dispersed a rally protesting against the pension reform were set on fire. Unidentified persons threw Molotov cocktails at them.
Explosions, fights with the police, smoke and tear gas are everywhere - in Paris, the degree of confrontation between protesters against the pension reform and the security forces is growing. People are building barricades right on the street, burning garbage and throwing stones at the police.
In response, law enforcement officers are trying to cut off the protesters from each other and use tear gas, it is almost impossible to breathe calmly on the streets of the French capital.
Authorities expect between 500,000 and 650,000 people across the country to take to the streets today, up to 100,000 in Paris, reports France 24.