After all the theories being thrown around today, I’ve settled on a long-range missile attack being the most likely. Russia, and Ukraine as a matter of convenience in perhaps a strange twist of fate, is running with this truck being a bomb as a red herring methinks. And it is likely not a coincidence that a fuel-laden train was there.
note: the photos flagged as sensitive content here are just of the explosion aftermath
Hopefully they'll finish the job tonight.