As noted in my recent story about covert wars:
One recent missive from ISIS to its followers advised them, "If you are able to kill an American or European infidel—particularly any of the hostile, impure Frenchmen—or an Australian or a Canadian, or any [other] infidel enemy from the countries that have banded against the Islamic State, then put your trust in Allah and kill him, by any way or means. Do not consult anyone and do not seek a fatwa from anyone. It is immaterial if the infidel is a combatant or a civilian. Their sentence is one; they are both infidels, both enemies. The blood of both is permitted…"
And then there’s this, in the same message: "If you cannot [detonate] a bomb or [fire] a bullet, arrange to meet alone with a French or an American infidel and bash his skull in with a rock, slaughter him with a knife, run him over with your car, throw him off a cliff, strangle him, or inject him with poison."