I have heard several different accounts. I cannot verify any of them yet.
Oil trucks go underneath bridges all the time. That isn't a big deal at all.
The crash-and-catch-fire part that destroys a major transportation artery is a big deal. And with that much damage, the question that must be asked is, "was it an accident?"
If there is a dashcam video, it will provide a definitive answer to that question. Even witness testimony must exist to answer that question. It was a busy highway and lots of people saw what happened. What did they see?
We haven't heard yet.
Actually since it was off an intersection ramp going downhill underneath, the witnesses would more likely be from the surrounding community which looks like business park and shipping type properties right up to the street and interstate. 95 drivers likely wouldn’t really know. Plus, this was at 6:20 which might not be that busy yet.