Grenade and rifle shooting in Trappes: the police deploy a security perimeter in the middle of the night. A witness sent a video to investigators: around 11:15 p.m., the arrival in the neighborhood of four hooded men, boarding a Kia car.

One member of the trio shoots into the air several times, with a shotgun-type weapon. Another was holding an assault rifle, which he did not use. The team got back into the Kia and fled towards La Verrière, the neighboring town.