Bomb it, it’s an invasion!
If such a nefarious plot were to be hatched. I would recommend a Pave Pat Blue, Fuel/Air Explosive rolled out of the back of a C-130 between 3 and 5,000 feet AGL.
Diverting from Indian Town Gap, PA. Army/Air Force Reservation. Where all kinds of flares and munitions are regularly tested. For about 40 minutes. And set for ground detonation in the center of town.
It’s the closest thing to nuking something from orbit. Just to be sure.