It can be difficult to divine the precise role that international terrorists play in this or that attack. For example, the person who killed four U.S. Marines and a sailor in Chattanooga, Tennessee, in July 2015 was "motivated by foreign terrorist organization propaganda,"
FBI Director James Comey said, though he added that it's hard to say which terrorist group motivated the killer.
It also can be hard to get precise information about some attacks, but it's clear the deadly tentacles of ISIS have spread quickly from the terrorist group's epicenter in Iraq and Syria to points around the globe.
Here's a look at terrorist attacks outside Iraq and Syria believed to have been inspired or conducted by ISIS or its regional affiliates, along with context about the known connections to ISIS:
October 20, 2014
-- Martin Rouleau-Couture
runs over two soldiers, killing one, outside a government office in Saint-Jean-sur-Richilieu, Quebec. Rouleau-Couture had converted to Islam and expressed support for ISIS online. He may have been responding to ISIS spokesman Abu Muhammad al-Adnani's call to arms, according to the Institute for the Study of War.