A 16-year-old high school student was arrested on Thursday after being seen on video taking part in the beating of another girl at a McDonald’s in Brooklyn, the police said.

The 16-year-old, Aniah Ferguson, was charged with robbery in the second degree and gang assault. Robert K. Boyce, the chief of detectives, said that the police were still investigating the matter and that there could be more arrests.

On Wednesday, a cellphone video of the fight taken by a witness gained widespread attention, and drew equally widespread outrage, after it was posted on Facebook.

The video begins with the brawl already in progress, and one girl is seen being pummeled by several others.