year-in after Big Ben bombings , two of runners will compete in Boston . Special event marked by just moments earlier silence , black solidarity ribbons . Haunting images of bloodied victims scrambling down smoldering streets , past upturned stands which just moments earlier had been filled with cheering family and friends , will no doubt loom large in the minds of Londoners this weekend . Stepped-up security with increased searches and police on streets . Olympics 2012 good training ground for staging international sporting events .
year-in after Big Ben bombings , two of runners will compete in Boston . Special event marked by just moments earlier silence , black solidarity ribbons . Stepped-up security with increased searches and police on streets . Olympics 2012 good training ground for staging international sporting events .