A campaign group says that Londoners will feel less secure as a result of a military training exercise taking place in the capital. Snipers, pilots and missile operators are being trained in preparation for the 2012 Olympics.
"This military presence in the city is unacceptable. Far from safeguarding Londoners as they go about their daily lives, they will bring a real fear of explosions and the prospect of these places becoming a target for terrorist attack.
"These manoeuvres taking place create a climate of fear in the city, and allow a future military presence to be established more easily.
"If the Olympic park needs security, this should be within the confines of the park and not forced on ordinary people in east and south London who have no say in the matter."
The Royal Navy's largest warship, HMS Ocean, sailed up the Thames today as the military stepped up security preparations for the Olympics.
The appearance of fighter jets in the skies over London will mark the start of an extraordinary Olympic test event.