Mr. Speaker, given its mandate and specific operational requirements, CSIS does not disclose details related to operational activities.
As stated in the most recent “Public Report on the Terrorist Threat to Canada”, as of December 2017, there were just over 60 individuals with a nexus to Canada who had travelled abroad to engage in terrorist activities and subsequently returned to Canada. Those numbers have remained relatively stable over the past two years, as it has become more difficult for extremists to successfully leave or return to Canada. Any further disclosure of more detailed information regarding extremist travellers could identify specific operational interests.