The clip circulated on social media app Snapchat shows a person punching a woman, as she sat using her phone on a busy Bakerloo Line carriage.
The context of the videos is unclear, but it is thought the violent stunts were filmed and shared as 'pranks', intended to gain 'clout' online.
A girl, aged 16, was arrested on suspicion of possessing a sharp pointed article in a public place, and theft from a shop.
A second girl, aged 15, was arrested on suspicion of possessing a sharp pointed article in a public place, threatening a person with a sharp pointed article in a public place, and affray.
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