Supporters of Iran's moderate presidential candidate Mirhossein Mousavi take part in a demonstration against the election results in Tehran June 13, 2009. Hundreds of supporters of President Mahmoud Ahmadinejad and moderate challenger Mousavi clashed in Tehran on Saturday after a landslide victory for Ahmadinejad in a presidential election, a Reuters witness said. REUTERS/Caren Firouz (IRAN POLITICS ELECTIONS CONFLICT)