Le tueur de Trappes avait déjà été mis en cause pour des violences en 2024, sans conséquenceMediapart reports that Kevin Tessier, who shot at Black and Arab people with a submachine gun in Trappes and La Verrière on 23 October 2026, had been implicated for violence in 2024 without judicial consequences. A complaint filed by his victim was blocked at a police station and never reached the Nanterre prosecutor's office, which had also been seized of similar facts three days before the attack.