AlHijjah 21, 1432, Nov 17, 2011, SPA -- The U.N. nuclear chief said on Thursday it was his duty to “alert the world” about suspected work in Iran to develop nuclear weapons. International Atomic Energy Agency (IAEA) Director-General Yukiya Amano stressed the need for Iran to engage in serious talks and said he wanted to send a high-level mission to the country to address mounting fears about the nature of its nuclear activities.