Probably the worst nightmare for an IT person - no network, no computer, no working gadgets. Only warm tube books.
Experts from the Boeing company tested the rocket hitting targets with the help of microwave radiation. The goals in this case are computers, power supply systems, telephones ... in general, everything that contains some kind of electronics inside. The project was named CHAMP (Counter-electronics High-powered Microwave Advanced Missile Project). ')
In principle, this thing is positioned as a weapon of non-lethal action (it only disables electronics, people are intact), but I personally cannot predict what the result will be, if a person with a pacemaker is in the radius of action. Or even a hospital.