A video that has been doing the rounds on Chinese social media appears to show a humanoid robot malfunctioning and erratically “attacking” the crowd at a festival in Tianjin.

The footage, shot during the Tianjin Winter Gala Festival on February 9th, shows one of several Unitree H1 humanoid robots seemingly attacking a spectator who had extended their hand out for a handshake. Instead of responding to the gesture, the robot displays erratic arm movements and aggressively rushes toward the crowd before being pulled back by security guards and what looks to be a robot supervisor. The H1 robot appears to calm down before the video cuts off, but its violent outburst has raised concerns about the use of these autonomous machines around humans.