Six people have been held this week over a string of vegan activist attacks in the city of Lille, officials said, reports BBC News.
Nine businesses, including a butcher, fishmonger, cheese shop and a McDonald's, have had windows smashed and fake blood thrown on their walls in recent months.
Activists also spray-painted the slogan "Stop Speciesism", a term denouncing unethical treatment of other species.
Five of the six detained people have since been, or will now be, released.
However, the Lille prosecutor's office set a court date in December for a detained 21-year-old woman.
Tensions are high in the region after the port city of Calais reportedly cancelled a planned vegan festival on September 8th after learning of "a series of operations" by meat-eaters "aimed at stirring up trouble".
A court in Lille ordered for it to go ahead, however, after complaints by organisers.
The vast majority of French people eat meat, with vegans representing a tiny percentage of the population.
According to a 2016 survey, only around 3% of French people are vegetarian.
But a number of recent incidents have sparked debate in a country that has a long culinary tradition of eating meat.