And not just any bomb, an 8,000-LB Mark 6 (Fat Man, detonated over Nagasaki, was an earlier Mark 3 model).
Let's go to the newsreel (about a minute long)…
You can still visit the bomb crater in Mars Bluff, SC. Details here.
Incredibly Mars Bluff wasn't an isolated incident. In 1961, a B-52 crashed and accidentally dropped a pair of far-more-powerful Mark 39s onto Goldsboro, NC. The bombs' safety mechanisms meant to prevent accidental detonations worked in this case, albeit barely. [Details.]