NYTimes.- “There was a big explosion,” Antonio, who declined to give his last name, grudgingly recounted. “There was a big explosion. Things were flying all over. Everybody rushed outside.”

No one knew what had happened, but the first American soldiers arrived within hours. Only after the Soviets accused Washington of violating a nuclear test ban treaty did the United States concede, more than a month later, that the detonators on two of the three bombs that landed here had exploded on impact.

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