A previously unknown militant group calling itself the Organization for the Non-Proliferation of Nuclear Weapons in South Asia took responsibility for these actions. Its members mailed a number of political manifestos to the German and Swiss press, and repeatedly issue proclamations via telephone in broken German or English, according to contemporary accounts. Interestingly, the Organization for the Non-Proliferation of Nuclear Weapons in South Asia has never been heard of since.

Now, however, one of Switzerland’s leading newspapers, the Neue Zürcher Zeitung (NZZ), claims in a new report that the violent actions against German and Swiss scientists and engineering firms were likely undertaken by the Israeli Mossad. In a leading article published on Saturday, the Swiss daily cited “new, previously unseen documents from archives” in Switzerland and the United States, which allegedly shed light on these mysterious attacks.

The report rests partly on the work of Swiss historian Adrian Hänni, who argues that Israeli intelligence was eager to prevent Pakistan from acquiring access to nuclear energy. The prospect of Pakistan becoming the first Muslim-majority nuclear state was viewed by Israel as an “existential threat”, according to Hänni. Additionally, the Mossad had credible information that senior officials in Islamabad worked closely with the Islamic Republic of Iran, one of Israel’s mortal regional enemies. These factors convinced the Israeli leadership of the time to authorize a covert operation against a number of European firms and scientists who were allegedly aiding Islamabad’s pursuit of a nuclear arsenal, according to the NZZ.