Newsis of south Korea on Feb. 1 said this, quoting a report of the Japanese Asahi Shimbun.

It was reported that a report of the U.S. Department of Defense and a document of the U.S. air force opened to the public by Asahi Shimbun record dozens of data on the dangerous accidents related to nuclear weapons between the 1950s and the 1980s.

Among them is the one in which a U.S. fighter which flew at the Osan U.S. air force base in south Korea was put in flames while staging a drill for dropping nuclear bombs in January 1959, leaving part of the bombs dissolved and detonating device burnt away.

It was said that part carrying nuclear materials was separated from a nuclear bomb.

The paper said that the U.S. was making preparations for carrying nuclear materials anytime, ready for nuclear attack at the Osan U.S. air force base in the 1950s.