Thousands of French students have joined protests across the country over new youth employment laws.
The law will make it easier for employers to get rid of young people on the new contracts, without explanation.
Students in Rennes briefly barricaded themselves into the town hall as part of their protests, calling on the government to repeal the law.
Police moved in to clear the students from the town hall, but protests continued outside.
Dozens of universities and secondary schools across France were disrupted by student action.
In the Paris suburb of Vitry-sur-Seine, some protesters burned a car during a protest rally.
Prime Minister Dominique de Villepin proposed the idea after riots last year as a way to help disadvantaged young people find jobs.
President Jacques Chirac has appealed for dialogue to resolve the conflict as unions plan more protests at the weekend.