More Olympic security fears have been raised this week when it emerged 3,500 extra servicemen would be needed to help police the summer event, which begins in a couple of weeks. The Government said it was revealed only on Wednesday that contractor G4S did not have enough trained security staff. Defence Secretary Phillip Hammond said he had authorised the deployment of the 3,500 extra people, bringing the total number of military personnel contributing to Games security to 17,000.