The military will provide an extra 3,500 troops for security during the Olympics, to make up for a short-fall in private security guards.
A video posted online apparently shows military equipment, being used as part of Olympics security, left unguarded outside London flats.
The appearance of fighter jets in the skies over London will mark the start of an extraordinary Olympic test event.
Boris Johnson has announced that the military personnel who have been brought in to protect the Olympics and Paralympics will get free use of public transport. Personnel who are wearing their uniforms will be allowed to use Transport for London services without being charged.
The Home Secretary, Theresa May, appeared in the House of Commons earlier to answer urgent questions on security arrangements for the London Olympics.
It's been revealed that an extra 3,500 military personnel will have to be deployed because of a short-fall in the number provided by the private security firm G4S.
A group of British soldiers, injured in the line of duty, has been forced to abandon their attempt to climb Mount Everest because of safety fears.
Five soldiers, two of them from London, had hoped to try for the summit towards the end of this month.
It was Prince Harry who broke the news of their disappointment during an award ceremony in Washington last night.
Soldiers have taken to the rooftops of residential areas in London, as part of the capital's security training exercise ahead of the Olympics.
Typhoon fighter jets have arrived at RAF Northolt in West London ahead of a major military exercise to test security for the Olympic Games.
It is the first time that fighter planes have been stationed there since the Second World War.
The aircraft can travel at up to 1,370 miles per hour.
The fourth typhoon overshoots the short runway on its first attempt to land.
The military insists that it is keeping disruption to a minimum, as it stages a training exercise in the skies of London ahead of the Olympics.
Fighter jets and military helicopters will be operating above the capital, so that pilots become familiar with the airspace.
They will also be testing procedures used to intercept and communicate with aircraft breaching restricted airspace.
Air Vice-Marshal Stuart Atha, Air Component Commander for Olympics Air Security said:
– Air Vice-Marshal Stuart Atha, Air Component Commander for Olympics Air Security
“We have sought to limit the amount of flying to the minimum required to ensure that our Forces are ready for their important role delivering air security for the Olympics, balancing this against the need for us to reduce disturbance to a minimum.
"But we hope that people will understand the need for this very important training, and we thank them for their continued strong support.”
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.
– Stop the War Coalition
"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."