London Mayor Ken Livingstone lays a wreath at Tavistock Square in London where the number 30 bus was bombed on the first anniversary of the July 7th bombings, July 7, 2006. Britain marked the first anniversary of the London bombings on Friday in a mood of sombre reflection but many still fear Islamist militants, having attacked them once, might do so again. REUTERS/Lefteris Pitarakis/Pool (BRITAIN)