Claude Sinké, aged 84, a former local election candidate for the far-right Front National – now called Rassemblement National – is in custody for the attack on a mosque in Bayonne in south-west France on October 28th 2019. He told detectives his aim was to “avenge the destruction” of Notre-Dame cathedral in Paris from a fire which he blames on Muslims. Marine Le Pen and the rest of the RN leadership have been quick to distance themselves from their former activist. But Claude Sinké had been adopted as a candidate for the far-right party in 2015 despite posting hate-filled messages on Facebook. Marine Turchi and Matthieu Suc examine the far right party's handling of its supporters and look at the growing threat posed by right-wing extremists in France and across Europe.