Could this be the the kind of future terrorism we’ll face? The cost of an attack is almost zero and the returns in the hundreds of millions of dollars, if not billions. No bomb making or specialist training necessary.
An interesting question: Why haven’t and/or why wouldn’t a terrorist group want to claim responsibility for this. Even if not actually responsible, it would spark another round of terrorism and civil rights debates as well as surely costing a great deal of money if not to better secure against such threats, then at least to endlessly talk about them.