Iranian Foreign Minister Mohammad Javad Zarif speaks during a recent news conference in Rome. Zarif told NPR that the U.S. has been hesitant and contradictory in its approach to dealing with the self-declared Islamic State. Fabio Campana/EPA/Landov hide caption

itoggle caption Fabio Campana/EPA/Landov

Iran's Ali Akbar Salehi, who heads the country's Atomic Energy Organization, says four saboteurs have been arrested and are being interrogated. Alexander Klein/AFP/Getty Images hide caption

itoggle caption Alexander Klein/AFP/Getty Images