A new book claims Israel's spy agency dispatched assassins into Iran, as part of a campaign to sabotage the country's disputed nuclear program.

Israeli operatives have killed at least four Iranian nuclear scientists, including targeting them with operatives on motorcycles, an assassination technique used by the Israeli spy service, the Mossad, according to authors Dan Raviv and Yossi Melman in their book to be published July 9, "Spies Against Armageddon: Inside Israel's Secret Wars".