Two of the missile systems to be deployed around London during the Olympics will be revealed today.
A huge security operation going on into next week will see high levels of military activity at Olympic sites around the UK.
A video posted online apparently shows military equipment, being used as part of Olympics security, left unguarded outside London flats.
Missile systems have been deployed in south-east London, in preparation for a training excercise ahead of the Olympics.
Ministry of Defence outlines plans for surface-to-air missiles to be deployed at six sites across London during the Olympics