Okay, I see now, after watching all of the videos here. Looks like an air strike (missile with a powerful warhead).
Kerch Bridge On Fire After an Explosion (Video of Strike Included)
https://en.defence-ua.com/news/kerch_bridge_on_fire_after_explosion_videos-4466.html
—” Looks like an air strike (missile with a powerful warhead).”
Yes, I put this up about ten times, but worth it.
Some history on bridge removal:
Can Ukraine destroy the Kerch (Crimea) Bridge?
https://youtu.be/kBECiXavaGA
I looked at the link at comment #81 five times and expanded it to double size. It looks down two double lane divided roads toward the main high bridge. You see a white truck moving toward you on the left side and several vehicles moving away on the right side. Finally you barely see a truck pn the left side arriving at the bottom of the high bridge and it explodes. I’m going to look at it some more to see if there is any sign of something hitting it. But I did not notice anything like that, so I think it either exploded on its own or was detonated, perhaps by a very corageous driver who sacrificed his life to destroy the utility of the bridge. And I repeat, it probably set the rail bridge or train on fire as well.