A computer virus was used to hack into venues linked to international talks on Iran's nuclear program, the Russian computer security company Kaspersky Lab said on Wednesday.
Kaspersky said it found the software in three European hotels used in the negotiations involving Iran and six world powers and also on Kaspersky's own computers.
Both Kaspersky and the U.S. security company Symantec said the virus shared some programming with previously discovered espionage software called Duqu, which security experts believe to have been developed by Israelis.