Something similar has happened during France's presidential election season.
One photographer reported seeing a riot officer engulfed in flames.
At the event Le Pen compared Macron to U.S.
In the graphic novel, Durpaire looks at how a Le Pen presidency would interact with U.S. President Donald Trump and Russian President Vladimir Putin also predicting riots and trouble in France.
Masked youths threw molotov cocktails.
Speaking at a convention centre in northern Paris, Macron, however, said Le Pen "had fed off worry and hate for years".
The election runoff takes place next Sunday.
But Nastassja Naguszewski, 28, who works in local government, said: "You have to put Le Pen as low as possible".
Two unions, the CFDT and Unsa, have called for their members to back Macron.
With just days left to convince French voters of their credentials, the candidates vying to become president kicked off the final week of the campaign with attacks on each other created to woo over wavering or undecided voters.
Ms Le Pen's campaign manager David Rachline also played down plagiarism accusations, painting her speech as a form of tribute to Mr Fillon.
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"I do think this shout out was much appreciated, even by Mr Fillon's supporters", he told France's TV2.
'She represents racism and hatred, that's why we're opposing her, ' said one Left-wing activist, who asked to be referred to as Nicole, 22.
"It's facism, Naziism, homophobia, anti-Semitism: all her baggage and everything we've always been against and which scares me", said Pauline Davranche, 79, at pro-Macron rally of students and the CFDT national trade union.
'One officer suffered serious burns to the face just after 3pm.
Yesterday Ms Le Pen said: "If there are waiting lists for the Alliance Francaise in Shanghai, Tokyo, or Mexico, for the French secondary school in Rabat or Rome. that is because France is something else, much more than the industrial, agricultural or military power that it must and can once more become".
Varoufakis wrote that it was a "veritable mystery" why "certain leaders of the left" had not yet favored the centrist candidate Macron over the far-right Le Pen in the second round of the French presidential election scheduled on May 7.
Le Pen borrowed from a speech delivered last month by Francois Fillon, the former Republicans party candidate, about France's important role in Europe and the world.
Fillon's free-market economic policy differed from Le Pen's protectionist stance, and he has backed Macron in the second round.
A writer well-known in ultraconservative circles, Paul-Marie Couteaux, claimed credit for the passage used by both Le Pen and Fillon.
Macron paid his respects at Paris's Holocaust memorial.