A demonstrator takes part in a march among fumes of smoke bombs during clashes taking place at a march for the annual May Day workers' rally in Paris on Monday.
A police source said: 'Around one hundred hooded protestors got as close as they could to police lines, and then one or two threw Molotov Cocktails.
It appears far-right French presidential candidate Marine Le Pen plagiarized nearly an entire speech from former French prime minister, as well as her former rival presidential candidate, Francois Fillon.
In Paris, Le Pen's 88-year-old father Jean-Marie - whom she kicked out of the FN in 2015 - paid tribute at a gilded statue of Joan of Arc, whom the party has adopted as a nationalist icon.
Reacting to the scenes on Twitter, far-right presidential candidate Marine Le Pen said: "This is the sort of mess. that I no longer want to see on our streets".More news: FBI's Comey defends pre-election Clinton email decison
But Le Pen has had problems of her own.
Le Pen, who has campaigned to pull France out of the single currency Eurozone, said she would introduce a "new currency" if she wins on May 7.
Ygal El Harrar, head of "En Marche!" in the United Kingdom, says the movement will not only campaign "against a racist party" but also to convince voters that they should vote for Macron rather than against Le Pen.
Marine Le Pen's party aides have defended accusations of plagiarism. The comment was a reference to Macron's time as economy minister under the unpopular Socialist President Francois Hollande.
Actress Celine Sallette said: "We need to defend the arts that make us feel uncomfortable, elevate us, move us or make us think, making us more human".
Mr Macron's spokeswoman Anne Lebreton told Sky News: "She pretends to be the people's candidate". But at the 1995 event, a group of skinheads broke away and pushed 29-year-old Brahim Bourram off a bridge into the Seine, where he drowned.More news: House Passes Overtime Bill
Poland's Foreign Ministry is denouncing French presidential candidate Emmanuel Macron's comparison of Poland's government to the "regimes" of Russia's Vladimir Putin and Hungary's Viktor Orban.
Macron hugged Said Bourram, who was 9 when his father was killed.
A protestor simply identified as Sophie told Le Monde, "I am against Macron, but the most urgent thing is to stop the Front National from winning".
"I will not forget anything and I will fight to the last second, not only against her project but against the idea she has of democracy and the nation", Macron declared. The death drew national outrage.
Said, a chauffeur who supports Mr Macron, said his father was targeted "because he was a foreigner, an Arab".
Nicolas Dupont-Aignan, who was also in the running for the French presidency, has been selected by Ms Le Pen to be the prime minister of France if she won the election.More news: Putin supports plan to investigate reported abuse of gays
Ms Le Pen mentioned France's "three maritime borders" with the English Channel, North Sea and the Atlantic.