Third teenager held after video of boy being punched is posted on social media

A third teenager has been arrested after a video of a boy being punched in the face and then mocked was shared on social media.
Officers investigating the incident said they arrested a 17-year-old boy on Wednesday on suspicion of assault, and were currently questioning him at an east London police station.
The 30-second clip showing four youths in woodland was shared to Facebook group Pure Banter on Monday night and subsequently taken down.
In the video, a boy in a grey hoodie is punched in the head with such force that he slams to the ground, as he talks to someone on a mobile phone.
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