According to recent government statements Islamic terrorism is the biggest threat to Canada . The Canadian Security Intelligence Service ( CSIS ) reported that terrorist radicalization at home is now the chief preoccupation of Canada 's spy agency . The most notorious arrest in Canada 's fight on terrorism , was the 2006 Ontario terrorism plot in which 18 Al-Qaeda-inspired cell members were arrested for planning a mass bombing , shooting , and hostage taking terror plot throughout Southern Ontario . There have also been other arrests mostly in Ontario involving terror plots
2006 Ontario terrorism plot
2006 Ontario terrorism plot
Islamic terrorism