our correspondent nick bryant sent us this report from ottawa. >> reporter: ottawa remains a city on edge, with the kind of heavy security presence that canadians normally associate with america. the police still haven't ruled out the possibility that the gunman who attacked the country's war memorial and parliament had accomplices. they don't want to be caught out again. the police believe that the man who carried out this attack on parliament was a muslim convert in his early 30s who had his passport taken away because of suspected jihadist sympathies. before being shot dead, he killed a canadian soldier, on guard at the country's war memorial. 24-year-old nathan cirillo. addressing the nation, canada's prime minister steven harper said the attacks were a reminder that the country wasn't immune from terrorism. >> we will not be intimidated. canada will never be intimidated. in fact, this will lead us to strengthen our resolve and redouble our efforts, and those of our national security agencies, to take all necessary steps to identify and counter threats and keep canada safe here a