In recent days, Canada has become more involved in the global fight against ISIS.
And like other Western nations, its battle against the radical Sunni militant group has its own risks, including at home, reports GHN based on CNN.
Those concerns came to the forefront when a gunman killed a reservist outside a war memorial in Ottawa -- then stormed into parliament, sending lawmakers hiding behind barricaded doors.
Authorities haven't disclosed any connection between the gunman, Michael Zehaf-Bibeau, and ISIS. In fact, no group has come forward claiming responsibility for the attack.
But the attack came two days after a "radicalized" man killed a soldier with his car, and five days after Canada raised its threat level.
In that context, here's why Wednesday's incident is a cause for concern:
Canada approved air combat missions against ISIS this month. The move to deploy six fighter jets as part of the coalition strike force came after days of debate by lawmakers.
"We do not take the step lightly. ... If left unchecked, this terrorist organization will grow and grow quickly," Harper said after he got the OK for combat missions. "They have voiced their local and international terrorist intentions and identified Canada as a potential target."