The Mayor of London has slammed violent video games for being a cause of the knife crime epidemic in the capital.

Writing in a piece for Thelondonpaper, Johnson, who examined the issue of London's 'knife crisis', wrote: "We must show young people that knives are not cool, and for that we need positive role models.

“I want to counteract the damaging influences drug-addled celebrities and violent video games and the lure of the life in the gang by providing opportunities.”

It's not the first time Johnson has criticised video games. In January 2007, he wrote an article on his website where he described them as "narcotics for children".

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