Estimates show that if a 400 kiloton B61-11 nuclear bomb were used against Mount Klang, depending on the wind direction, radioactive fragments could reach as far south as Yasuj, as far west as Khorrambad, and as far north as Tehran. "The following cities will have to evacuate - that is, Qom, Golweigan, Khomein, Isfahan, Shahr Reza, Qom and South Tehran - of course, temporarily. "So what? The source describes a hypothetical scenario of using nuclear weapons against an underground facility in the Mount Klang region of Iran, and claims that radioactive fragments could spread far, necessitating the evacuation of cities.