On January 23rd, 1961, the United States almost nuked itself by accident. On that day, according to a recently unclassified document obtained by The Guardian, the US Air Force mistakenly dropped a pair of hydrogen bombs over Goldsboro, North Carolina. The bombs each carried a 4-megaton payload and were about 260 times more powerful than the atom bombs dropped on Hiroshima and Nagasaki, Japan, in 1945 during World War II, The Guardian says in a report.

The document was shared with The Guardian by journalist Eric Schlosser, who is currently researching the nuclear arms race for an upcoming book, Command and Control. Schlosser tells the newspaper that he has found at least 700 noteworthy incidents involving nuclear weapons that took place between 1950 and 1968 — but the public largely doesn't know about any of them. "The US government has consistently tried to withhold information from the American people in order to prevent questions being asked about our nuclear weapons policy," he says in the report. "We were told there was no possibility of these weapons accidentally detonating, yet here's one that very nearly did."

If the bombs had gone off, the carnage would have reached into Baltimore, Washington DC, Philadelphia, and New York city. "Yeah, it would have been bad news — in spades," Parker F. Jones, then supervisor of nuclear weapons safety at the Sandia National Laboratories, writes in the formerly-secret document. "One simple, dynamo-technology, low voltage switch stood between the United States and a major catastrophe!"