The urban supervision centre of Sarcelles called the police to alert them that some people were attacking one of their cameras, Friday at 23 h 45. A patrol went to the scene and saw the suspects who were fleeing towards Seine-Saint-Denis. They did not succeed in challenging them but were able to identify a member of the group. Twenty minutes later, another patrol car spotted a man matching the description of the suspect. Aged 20 and living in Sarcelles, he was stopped in a square near the boulevard Jacques Copeau.