category 1 foreign nation states: China, Iran, Russia
category 2 the USSA's deep state: either they are trying to steel the election(trump) or they are covering up steeling the election(Biden) or their just they are just trying to justify harsher lockdowns(fauci).
category 3 individual actors: Right wing extremists, leftwing extremists, Islamic extremists or just an enraged former employee who's pissed about getting fired.
Thoughts?
category 4 it's part of an elaborate "jewel heist" and the thieves were knocking out communications with the blast so they could pull a job in a building affected by the outage.
It's the type of thing Walter White or Danny Ocean would come up.
This is what I would do to prevent alarms or comms going out from the heist location.
1:
Possibly, or domestic terrorist fomented by one of those 3. The issue would be to cause more economic chaos.
2:
No clue. Some rumors that it was to take out emergency broadcasting equipment. Harsher lockdowns don't make sense, because people are now going to be more afraid of staying in lockdown when there could be a random RV exploding.
3:
Right wing "extremist" is a possibility, but why a bomb and not a gun?
The warning from the van indicates a desire to preserve life, but at the same time the bomb indicates a desire to destroy businesses and property. This sounds more like a left wing extremist.