The sister of French Islamist militants Fabien and Jean-Michel Clain was put under formal investigation for criminal association in relation to a terrorist undertaking and remanded in custody on Saturday, a judicial source said.

Anne-Diana Clain, born in 1975, was arrested Tuesday night at Roissy international airport near Paris along with her partner, who had already been put under investigation for the same reason, and their eldest son.

The family had been expelled from Turkey, which serves as a gateway to Syria for Islamist militants from Western countries.

Fabien Clain appeared on the audio recording of Islamic State’s claim of responsibility for the attacks on Paris in November 2015 that killed 130 people.

The voice of his younger brother Jean-Michel was heard behind him on the recording that was posted by Islamist State.

French authorities suspect the two brothers, who are from the Réunion island in the Indian Ocean, to be in Syria.

Community Organisations Tackling Hate Incidents and Hate Crimes Come Together in France

Three French anti-racism associations said on Sunday they would file legal complaints against social networks Facebook, Twitter and Google’s Youtube for failing to remove “hateful” content posted on their platforms.

French law requires websites to take down racist, homophobic or anti-semitic material and tell authorities about it.

But French Jewish students union UEJF and anti-racism and anti-homophobia campaigners SOS Racisme and SOS Homophobie said the three firms had removed only a fraction of 586 examples of hateful content the anti-racism groups had counted on their platforms between the end of March and May 10.

Twitter removed only four percent, Youtube seven percent and Facebook 34 percent, according to the associations.

“In light of Youtube, Twitter and Facebook’s profits and how little taxes they pay, their refusal to invest in the fight against hate is unacceptable,” UEJF president Sacha Reingewirtz said in a statement.

Germany got Facebook, Google and Twitter to agree in December to delete hate speech from their websites within 24 hours.

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