A barred window is seen at the Embassy of Iran in London February 18, 2012. Iran is clearly trying to develop a nuclear weapons capability, and if it succeeds it will set off a dangerous round of nuclear proliferation across the Middle East, British Foreign Secretary William Hague said in an interview published on Saturday. The embassy had been ordered closed by Hague in late November 2011. REUTERS/Luke MacGregor (BRITAIN - Tags: POLITICS)AP – A senior Iranian intelligence official says an estimated 16,000 computers were infected by the Stuxnet virus.