The Swiss Attorney General�s office has opened a criminal case into alleged spying on talks over Iran�s nuclear program, TASS reported.

The probe concerns unidentified actors involved in prohibited spying activities in Switzerland, said the office�s spokesman, Andre Marty.

Kaspersky Lab earlier said it had uncovered a spy campaign targeting hotels that hosted the negotiations between Tehran and six world powers.

Israeli Deputy Defense Minister Eli Ben-Dahan on Wednesday denied a report that Israel carried out a cyber-espionage campaign targeting the hotels. US officials have accused Israel of spying on the talks in the past, the Jerusalem Post said.

By RT