Hoax until proven otherwise. If not a hoax it sounds like a home grown assassination plot with cheap drones, cheap explosives and amateurs. Those gas tank explosions could have been a contingency plan to destroy evidence.
If there was a 3rd party involved such as Columbia there role would have been limited. Perhaps intel or the drones themselves or explosives.
Maduro will use it as an excuse to arrest and confine political opponents or others trouble makers who’ve been acting in a lawful manner.
But of course. As Inspector Louis would say; "Round up the usual suspects!" Any self-respecting tyrant has his enemies list and then a larger list of potentials. Got to keep your security forces focused on someone other than YOU!
Never let a crisis (or random event) go to waste.