Can anything be done? Every year, teenagers in Britain lose their lives to knife crime. Actor Idris Elba hopes his new campaign will reduce them dramatically.
The London rapper calling time on knife crime
Disturbing reality: Half of teenagers in England and Wales have witnessed or been victims of violence, study reveals. Glossary
Idris Elba - An English actor, rapper and singer, born in London in 1972.
Campaign - An organised set of actions to achieve a certain goal.
Tougher - Harder or stronger.
Politicians - Someone whose job it is to be involved in running a country. Politicians try to persuade people they have the best ideas to run the country.