A top Iranian official will discuss his country's nuclear programme with the U.N. atomic watchdog boss Mohamed ElBaradei in Vienna this week, the official 'IRNA' news agency reported on Saturday. IRNA said the head of Iran's Atomic Energy Organization, Gholamreza Aghazadeh, would meet on Monday with ElBaradei, the head of the U.N.'s International Atomic Energy Agency. The five permanent members of the U.N. Security Council and Germany will meet on April 16 in Shanghai to discuss whether to sweeten incentives they offered Iran in 2006 to curb its nuclear programme. Iran announced on Tuesday it had expanded its nuclear work by starting to install 6,000 more centrifuges.