Olympic air defences main role 'to detect threat'

Ground based air defence is rolled out for nearly all Olympic games. Principle role: detect threat @londontonight

Any decision to deploy missiles or take action is a "political" decision taken on a "political level" @londontonight

Ward Cllr for Blackheath says residents are concerned abt security of site. He's told there would be 24/7 armed presence @londontonight