The Russian embassy in France said it had asked for an explanation but had not heard back from French authorities.

According to TF1, Durov faced a warrant in France based on a preliminary police investigation. The French authorities reportedly claim that Telegram’s lack of content moderation and unwillingness to cooperate with law enforcement make Durov an accomplice to the drug trafficking, money laundering, and sharing of child pornography that allegedly occur via the app.

The reported arrest will likely fuel further debate around the extent to which messaging apps should be held responsible (legally and otherwise) for the messages their users share.