Iranian opposition supporters chant slogans in support of hardline President Mahmoud Ahmadinejad's main challenger, Mir Hossein Mousavi (portrait), as they protest during a rally marking Quds (Jerusalem) Day in Tehran on September 18, 2009. Riot police, armed with batons, beat protesters who were pelting them with stones at Tehran's key Haft-e Tir Square after the main speeches at the Quds Day rally, witnesses told. Getty Images logo Getty Images 29 months ago

Iranian opposition supporters chant slogans in support of hardline President Mahmoud Ahmadinejad's main challenger, Mir Hossein Mousavi (portrait), as they protest during a rally marking Quds (Jerusalem) Day in Tehran on September 18, 2009. Riot police, armed with batons, beat protesters who were pelting them with stones at Tehran's key Haft-e Tir Square after the main speeches at the Quds Day rally, witnesses told.