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