Police detained a 19‑year‑old man on September 16 after a protest against artificial intelligence erupted into violence on Jeanne‑Mance Street in downtown Montreal. The demonstration, organized by the activist group Résistance Montréal, was staged near the All In technology conference and originally proceeded without incident. Around the intersection of René‑Lévesque Boulevard and Sainte‑Catherine Street, a segment of the crowd began to clash with law‑enforcement officers, prompting officers to make a single arrest.
The protest aimed to denounce perceived risks associated with AI, a theme that has drawn attention from both technologists and civil‑rights advocates. Organizers had announced a march to voice concerns over the rapid deployment of AI systems, emphasizing potential threats to privacy, employment and democratic processes.
According to police, the situation escalated when a small number of participants engaged in violent behavior, leading officers to intervene. The detained individual, identified only by age, was taken into custody without further incident. No injuries were reported and the protest was cleared shortly after the arrest.
The incident follows a series of public demonstrations across Canada targeting AI development, reflecting growing unease among segments of the population. While the majority of the crowd remained peaceful, the episode underscores the challenges authorities face in managing protests that turn confrontational, especially when they occur near high‑profile events such as the All In conference.
The clash took place in the early evening, when traffic along Jeanne‑Mance Street was already heavy due to nearby office buildings and retail outlets. Police units arrived on scene within minutes and used standard crowd‑control techniques to disperse the agitators, according to the statement released after the incident.
Organizers of Résistance Montréal issued a brief statement after the protest, reaffirming their opposition to unchecked AI development and condemning the isolated acts of violence that marred the event. They indicated that the majority of participants remained committed to a non‑violent approach and expressed disappointment that the actions of a few had diverted attention from their core message.