The £3m It Doesn't Have to Happen marketing campaign, which launched in May, directed young people to a social networking page where they can upload photos of themselves holding written pledges not to carry knives.
The images are being used on posters which were unveiled on Friday (14 November).
Young people were also involved in a competition to design the campaign logo.
The winner, 15-year-old Hannah Cooper, said: "As part of my prize I got the chance to go and see the logo being developed at an agency and then went to a reception where I met with some of the Olympic athletes and the Prime Minister."
The campaign has also launched a competition this week in partnership with MTV. Young people are asked to send videos showing their creativity for the chance to win up to £1000.
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