Rapier missiles, like those shown in the video below, are to be deployed around London during the Olympics.
Company video from Hertfordshire-based missile manufacturer MBDA.
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