A US 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.
The Guardian newspaper said the document, obtained by investigative journalist Eric Schlosser under the Freedom of Information Act, gave the first conclusive evidence that the United States came close to a disaster in January 1961.
The incident happened when two Mark 39 hydrogen bombs were accidentally dropped over Goldsboro, North Carolina, after a B-52 bomber broke up in mid-air.
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