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 St Germain took another big step towards the Ligue 1 crown with a 3-1 home win over second-placed Olympique de Marseille on Sunday to extend their lead at the top to 19 points.