21 people were arrested before, during and after Le Classique between Marseille and Paris Saint-Germain at the Stade Velodrome on Sunday night.
Eight police officers have suffered bruises, while one of officers was hit by a stone in the face and will stay at the hospital for at least seven days.
According to Le Parisien, 21 people were arrested at the game, a match where the Marseille ultras unveiled a tifo against the Ligue de Football Professionnel (LFP).
A large number of smoke bombs were set off, while the match had to be stopped because of some objects launched in the direction of the corner flag, where Neymar was about to take a corner kick.
In the second half, a fan stormed onto the pitch and ran to the direction of Lionel Messi, while outside the stadium hundreds of people tried to get in when the gates were closed. The police had to intervene and tear gas some fans.
Fortunately, there were no issues reported after the end of the game.
It is not the first time that there has been trouble with the Marseille fans this season, as they have already been sanctioned twice by the LFP disciplinary committee for incidents in the stands, first after the Nice match on August 22 and then after the Angers duel exactly one month later.
After the Angers game, Marseille were warned that they could face a one-point deduction if a similar issue occurred again.