Media playback is unsupported on your device

The story behind the Olympic torch relay

17 May 2012 Last updated at 12:37 BST

The Olympic flame is due to arrive in the UK on Friday to mark the beginning of the torch relay for the London 2012 games.

Since its introduction, the relay has become a powerful symbol of peace and unity.

The BBC's Tim Muffett looks at the history behind the event.