Tens of thousands of people demonstrated in Paris on Sunday against same-sex marriange.
A spokesman for the Paris police told dpa that between 23,000 and 24,000 people marched in the demonstration, called La Manif Pour Tous, or Demo for Everyone.
Organizers said there were approximately 200,000 people present at the demonstration, which gathered at Trocadero in western Paris.
Same-sex marriage has been legal in France since 2013. The organization, which last protested in October 2014, is also against surrogate pregnancies, assisted reproduction technology and adoption by same-sex couples.
Six members of the women's movement Femen were detained by for demonstrating against the march, the police spokesman said.
The march on Sunday took place in the midst of campaigns for the conservative primary, held in two rounds in November to choose a candidate for the presidential race next year. None of the major candidates appeared at the march.