The first World Trade Center bomb comes to mind.
The Alfred P. Murrah Bldg. was terrorist (technique) inspired, if not directly assisted by same.
Imagine blowing up a stolen 18 wheeler hauling aviation grade, or racing grade gasoline, kerosene, liquid propane, etc, inside a transportation tunnel that doesn’t restrict such passage, during rush hour?
OK- I’ve got to get off this line of thinking, I’m demoralizing the thread and depressing myself.
Time to shout from the rooftops- TRUMP! TRUMP! TRUMP! TRUMP! TRUMP!
Starting.