Scores of teenagers start smashing up a Subway shop near Dagenham Heathway, East London, late Friday.

Sirens flare as the filmer says "they're all going to run now the Old Bill's coming."

"It wasn’t gang related," he told Newsflare. "Just think it was for them to post on social media to hype themselves up – members of the shop [staff] were cut to the face due to smashed windows."