When you think of a car purposely driving through a crowd, you might think of radicalized suicide bombers in other parts of the world.  Turns out it going on regularly  right here in the US.  From NPR.

Vehicle Attacks Rise As Extremists Target Protesters

At least 18 are categorized as deliberate attacks; another two dozen are unclear as to motivation or are still under investigation, according to a count released Friday by Ari Weil, a terrorism researcher at the University of Chicago’s Chicago Project on Security and Threats. Weil has tracked vehicle-ramming attacks, or VRAs, since protests began.