British authorities are investigating a possible link between the London bombings and an alleged London bomb plot last year involving Canadian Momin Khawaja, now awaiting the first-ever trial under Canada's new anti-terrorism act. British investigators and security intelligence sources in Europe and the United States say Mohamed Sidique Khan, a 30-year-old primary school teacher believed to be a key figure among the four suspected London suicide bombers, was possibly associated with some of the men arrested in and around the British capital in March, 2004. As part of a global investigation dubbed Operation Crevice, British police and security agents say...