Protesters in Paris smashed store windows and damaged cars after French President Francois Hollande said he would not abandon a labour Bill which has prompted weeks of sometimes violent demonstrations.
The Paris police department said groups of troublemakers damaged a supermarket, a job centre, bus stops and electric vehicles used in a municipal car-sharing service, among other businesses, in a late-night march on Thursday.
The violence came shortly after Mr Hollande was questioned on national television about the Bill, which is aimed at loosening labour rules to encourage companies to hire.
Mr Hollande's left-wing base considers it a betrayal of France's hard-fought worker protections.
The government has amended it in the face of resistance, but the President (pictured) insisted: "It won't be withdrawn."
Most of the protesters, led by unions and students, have been peaceful.