I’m thinking it’s not ISIS. There’s almost always some aspect of “transportation” involved in their attacks. Usually that means it’s a train station or the train or subway itself as a target. There are the jets of 9/11 of course. Lately trucks and cars are the weapon, plus some stabbing as Act Two.
The only Muslim attacks in the U.S. and Europe that come to mind immediately that do not have a transportation angle are the Minnesota stabber and the Boston Marathon. (I’m not counting “people running for fun” as “transportation” per se.)
Oops, Ariana Grande concert.