A top Iranian nuclear official sought Friday to ease international worries about his nation’s nuclear program days after Tehran test-fired an upgraded medium-range missile that alarmed the West.

Akbar Salehi, head of the country’s Atomic Energy Organization, said Iran won’t have a new generation of more efficient centrifuges for the production of nuclear fuel until 2011 and won’t have its heavy-water plant in Arak operational for “three or four years.” Source: LAT