Funny the title of the article says A bomb and the article says H bomb which are two different types of bombs
As I understand it, "atom bomb" is a colloquial catch-all term for all nuclear explosives, whilst "hydrogen bomb" is a specific type.
A U.S. atom bomb nearly exploded in 1961 over North Carolina that would have been 260 times more powerful than the device that devastated Hiroshima, according to a declassified document published in a British newspaper on Friday.
The incident happened when two Mark 39 hydrogen bombs were accidentally dropped over Goldsboro, North Carolina, after a B-52 bomber broke up in midair.