Story highlights Israeli Prime Minister's office, Foreign Ministry decline to comment on espionage allegations

Swiss authorities say a house in Geneva was searched in May and IT equipment was seized

An Austrian Interior Ministry spokesman says "all relevant locations" are being investigated

(CNN) Swiss and Austrian authorities are investigating claims of potential espionage during recent nuclear talks between Iran and world powers, including the United States, officials from each nation said Thursday.

The investigations started after Russian Internet security firm Kaspersky Lab said this week that it had uncovered a sophisticated cyberespionage weapon in use around the world, and specifically targeting hotels that hosted the nuclear talks.

An Austrian Interior Ministry spokesman, Karl-Heinz Grundböck, would give no further details but said "all relevant locations" are being investigated.

The Office of the Attorney General of Switzerland said it had "opened criminal proceedings against persons unknown on suspicion of political espionage."

A house was searched May 12 in Geneva, it said, "and IT hardware as well as software has been seized. The aim of the aforementioned house search was to seize respective information as well as the malware; it was of particular interest to investigate whether the malware infected the respective IT systems."

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