A second officer is now under criminal investigation for assault after a brawl at Manchester Airport, the police watchdog has said.
It comes after a video which went viral online showed 19-year-old Fahir Amaaz allegedly being kicked and stamped on by police during a disturbance near the arrivals hall on July 23.
Mr Amaaz and his brother Muhammad Amaad, 25, were restrained by officers, which led to protests in Rochdale and Manchester city centre amid claims of police brutality.
More footage emerged days later which showed the immediate lead-up to the disturbance, when two female police officers were hit to the ground before Mr Amaaz was Tasered.