AP Photo

The news that the Canadian Security and Intelligence Service and the Royal Canadian Mounted Police had arrested two men for alleged involvement in an al Qaeda-linked terror plot, and that further arrests are expected today, is an important reminder of the need for continued vigilance regarding terrorists attacks in North America. It is also proof that Canada takes the ongoing threat of terrorism seriously, and is working proactively to counter it.

Little is known about the plot alleged to have been planned by Misbahuddin Ahmed, an x-ray technician working for an Ottawa hospital, and his confederates, but this is not the first time that Canada has encountered terrorist activity within its borders.