Iran's presidential elections

Ayatollah Ali Khamenei casts his vote in his office in Tehran Photograph: Olivier Laban-Mattei/AFP/Getty Images

Khamenei after casting his vote Photograph: Olivier Laban-Mattei/AFP/Getty Images

President Mahmoud Ahmadinejad casts his ballot Photograph: Ahmed Jadallah/Reuters

Ahmadinejad flashes a victory sign while holding up his passport Photograph: Ahmed Jadallah/Reuters

A woman shows the ink on her finger after voting at a polling station in Tehran Photograph: Atta Kenare/AFP/Getty Images

Women cast their vote at a polling station in a Tehran mosque Photograph: Atta Kenare/AFP/Getty Images

A man casts his ballot at the Iranian consulate in Dubai Photograph: Reuters

A woman casts her ballot at the Iranian consulate in Dubai Photograph: Reuters

A woman checks ID cards Photograph: Olivier Laban-Mattei/AFP/Getty Images

A woman holds her ballot Photograph: Olivier Laban-Mattei/AFP/Getty Images

An electoral official observes proceedings in the polling station Photograph: Ben Curtis/AP

The leading challenger and reformist candidate, Mir Hossein Mousavi, speaks to the media after casting his vote with his wife, Zahra Rahnavard Photograph: Ben Curtis/AP

Presidential candidate Mehdi Karroubi shows his ink-stained finger Photograph: Atta Kenare/AFP/Getty Images

Women line up to vote at a polling station in a Tehran mosque Photograph: Olivier Laban-Mattei/AFP/Getty Images

A woman waits to enter a polling station in Cijaval Photograph: Morteza Nikoubazl/Reuters

Former president Ali Akbar Hashemi Rafsanjani casts his ballot Photograph: Reuters

President Mahmoud Ahmadinejad is greeted by his supporters in Tehran Photograph: AFP/Getty Images

Presidential candidate Mohsen Rezai casts his ballot at a polling station in Jamaran mosque in northern Tehran Photograph: Atta Kenare/AFP/Getty Images

Women hold prayer beads and registration cards as they line-up to vote in Qom Photograph: Amir Hesami/AFP/Getty Images

Women show their certification cards at a polling station inside the Masoumeh shrine in Qom Photograph: Amir Hesami/AFP/Getty Images