From what I read, ISIS terrorists were planning on making car bombs to blow up Trump Tower and the White House. They arrested two individuals working on this and teaching themselves how to make car bombs.
https://wham1180.iheart.com/content/2020-09-26-isis-supporters-allegedly-planned-attacks-on-white-house-trump-tower/?Sc=editorial&Pname=local_social&Keyid=socialflow&fbclid=IwAR1cEkev0d7oabGLrfaRg0pL-cknAnqt8KnshA_HUSuPJkexPr2i7LAZv8U