Dramatic footage captures the moment an elderly Black man slaps a teenager, who appears to be white, and knocks him to the ground after he allegedly uses the n-word.

The video was captured by a shocked commuter who filmed from a distance. Most of what is being said is inaudible as the senior citizen argues with the teen.

The man appears to tell the teenager to get off at the next stop when the racial slur is heard, prompting an immediate response. Slapping the teen in the face, the man mounts an attack as the video maker is heard gasping in shock at what has just unfolded.