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9 March 2019, 15:28 | Updated: 9 March 2019, 15:47
An activist who used to be part of a gang believes there could be 'hundreds of thousands' of knives on the streets of London.
Jermaine Lawlor admitted that he thinks up to 80% of young people could be carrying a knife in some parts of London.
Speaking to to Matt Frei, he said: "I think there will be hundreds of thousands of knives on the streets.
"Probably about 80% of young people carry one, it depends geographically where these young people are located.
"If you're working with young people that are based in Hackney or Brixton on a council estate, usually they carry a knife."
More to follow.