Security drills ahead of London Olympics
Though there is no specific threat, organisers say the armed forces will be prepared for anything.

Published On 20 Jan 2012
The British military has been carrying out security drills on London’s River Thames ahead of the Summer Olympic Games.
The event has become Britain’s biggest peacetime security operation.
Though there is no specific threat, organisers say the armed forces will play a big part in keeping athletes and spectators safe and be prepared for anything.
Al Jazeera’s Laurence Lee reports from London.