Can’t say we haven’t been warned.
Check it out:

The latest issue of Al-Qaeda’s Inspire magazine contains an article about using car bombs in U.S. cities as well as abroad during election seasons, both presidential and congressional, as well as on Christmas and New Years Eve.

The cities and areas listed in the piece include Washington, D.C., New York, Northern Virginia, Chicago, and Los Angeles.

America is our first target, followed by United Kingdom, France and other crusader countries.

As for the field target for the car-bomb, you have places flooded with individuals, e.g. sports events in which tens of thousands attend, election campaigns, festivals and other gathering. The important thing is that you target people and not buildings: