In January 2015, a series of terrorist attacks in Paris left 17 people dead, including 11 at the offices of satirical magazine Charlie Hebdo, and four Jewish men in a kosher supermarket. The attack on the kosher store was carried out by Amedy Coulibaly in the name of the so-called Islamic State group. A number of weapons later found at the scene and at his home transited via an arms trafficking network in northern France which had been the object of several lengthy police surveillance operations. So why have magistrates in charge of investigating the itinerary of the arms still not questioned those involved in the surveillance? Karl Laske reports.