This lengthy report was State Department Bureau of Intelligence and Research's contribution to the first National Intelligence Estimate on the nuclear proliferation, NIE 100-6-57. Written at a time when the United States, the Soviet Union, and the United Kingdom were the only nuclear weapons states, the “Fourth Country” problem referred to the probability that some unspecified country, whether France or China, was likely to be the next nuclear weapons state. Enclosed with letter from Helmut Sonnenfeldt, Division of Research for USSR and Western Europe, to Roger Mateson, 4 June 1957, Secret

Cable on a discussion with Japanese Disarmament Division Chief Tanaka, who was uncertain whether India would conduct the nuclear test or not.

Report on conversations between Japanese officials and a Pakistani source who indicated the location of the upcoming Indian nuclear test. The cable expressed doubts about the information, suggesting that the "stir" "may have been created largely on personal basis" by the Pakistani source.

In response to a request from the State Department, Ryohei Murata, an official at the Japanese embassy, reported that the Japanese government believed that for prestige reasons and as a “warning” to others, the “Indians have decided to go ahead with a nuclear test” which could occur at “any time.” The Thar Desert in Rajasthan would be the test site.