A French campaign group is urging the country's authorities to take action against homophobic and racist chanting by Paris Saint-Germain fans after the match against Marseille was marred by discriminatory singing.

Ousmane Dembele continues his fine form with a goal to help Paris St-Germain beat Marseille and edge closer to wrapping up a 13th Ligue 1 title.

Paris Saint-Germain remain on course for a historic unbeaten season in Ligue 1 after a 3-1 win over bitter rivals Olympique de Marseille in Le Classique on Sunday opened up a 19-point lead with 26 games played in France's top flight.