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Things tend to burn up in re-entry if they're not designed for it, and this wasn't designed for it. Many metals oxidize when super heated

There have been a bunch of very powerful non-nuclear explosions. Perhaps a part of an exploding ship such as in the halifax explosion or the Princess Irene?

Where is the rest of the exploded ship, in that case?

Maybe that was the "rumbling" they all heard! lol