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Newsnight has uncovered evidence of disturbing and violent imagery being shared online among young people in London.

The material includes videos of people being humiliated and abused with weapons held to their heads. One children's advocate says violence in the capital is escalating through online platforms. Katie Razzall reports.

(Image: Reporter sitting down and phone on a screen, credit: ÃÛÑ¿´«Ã½)