Centrist Emmanuel Macron and far-right leader Marine Le Pen are set to face each other in a May 7 runoff for the French presidency after coming first and second in Sunday's vote.
Several people were detained after left-wing protesters clashed with police in Paris on Sunday as early results from France's presidential elections were announced.
Protest in Paris ahead of the first results of the French elections. Guillotine included. pic.twitter.com/ebSKpegSNg— Lorena de la Cuesta (@LorenadlaCuesta) April 23, 2017
Several hundred young people rallied in the Bastille Square -- the historic site where the 1789 French Revolution began.
The demonstrators clashed with police, building barricades and throwing objects.
A protest leader called on the public through a loudspeaker to rally "against Marine and against Macron."
"We have come here to protest against the pantomime of this election," a demonstrator said.
Another "anti-fascist demonstration" also took place late Sunday in the western coastal city of Nantes.
Le Pen's father, Jean-Marie, scored the first breakthrough in the French presidential elections by the National Front, winning a slot in the runoff on the 2002 ballot.
He was routed in a head-to-head contest by the centre-right incumbent, Jacques Chirac.