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.

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.

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.