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October 5, 1961

National Intelligence Estimate, NIE 35-61, 'The Outlook for Israel'

National Intelligence Estimate on Israel concluded that "Israel may have decided to undertake a nuclear weapons program. At a minimum, we believe it has decided to develop its nuclear facilities in such a way as to put it into a position to develop nuclear weapons promptly should it decide to do."

January 20, 1966

National Intelligence Estimate, NIE 4-66, 'The Likelihood of Further Nuclear Proliferation'

This estimate updated an estimate (NIE-4-2-64) published in 1964 of the nuclear proliferation problem. That estimate, like this one, overestimated the likelihood of an Indian bomb, while somewhat underestimating Israel’s program. This assessment followed the same pattern—predicting India would produce a weapon within a “few years” and also putting Israel in the “might” category, although treating it as a “serious contender” nonetheless. Also following a short discussion of the “snowball effect” (later known as “proliferation cascades” or “chains”) suggesting that the United Arab Republic (Egypt-Syria) and Pakistan were likely to take the nuclear option should India or Israel go nuclear.

March 30, 1983

CIA Report, 'New Information on South Africa’s Nuclear Program and South African-Israeli Nuclear and Military Cooperation' (redacted)

CIA report summaries new information on Israel-South African nuclear cooperation. According to the report, South Africa formerly launched its weapons program in 1973, and paused it in 1979 following the international discovery of the Kalahari nuclear test site. Military cooperation between South Africa and Israel is believed to be extensive, with continual contact between personnel and the large-scale sale of arms. Aside from the South African sale of depleted uranium to Israel in the mid-1970s, the CIA had no hard evidence of nuclear cooperation between the two.

October 21, 1964

National Intelligence Estimate NIE 4-2-64, 'Prospects for a Proliferation of Nuclear Weapons Over the Next Decade'

This US analysis of the likelihood of nuclear proliferation during the next decade was finished only days after the first Chinese nuclear test on 16 October. The report analyses the implications of this test, as well as programs in India, Israel, Sweden, West Germany, Italy, Japan, Canada, and others. The National Intelligence Estimate (NIE) argued that India was the only new state likely to develop nuclear weapons, concluding that “there will not be a widespread proliferation …over the next decade.”

June 23, 1963

National Intelligence Estimate NIE 4-63, 'Likelihood and Consequences of a Proliferation of Nuclear Weapons Systems'

This NIE comes to the general conclusions that “there will not be a widespread proliferation of nuclear weapons over the next 10 years” and discusses programs in various countries (Israel, China, Sweden, India, West Germany, Japan, etc.) This copy includes newly declassified references to the Israeli nuclear weapons program, including the conclusion that “the Israelis, unless deterred by outside pressure, will attempt to produce a nuclear weapon some time in the next several years.”