Fighter jets over London as it prepares for Games

LONDON (Reuters) - Fighter jets flew into a base in northwest London on Wednesday, the first time they will be stationed in the capital since World War Two, at the start of a week of military exercises to test out security ahead of the Olympic Games in July.

Codenamed "Olympic Guardian" and involving airmen, soldiers and sailors, the exercises are aimed at reassuring Britons and foreign visitors that everything possible is being done to keep them safe during the games.