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Iranians are voting in a tight presidential run-off. Here, a woman proudly shows the ink on her finger after casting her ballot.

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A man votes under the gaze of portraits of Islamic Republic founder Ayatollah Khomeini (right) and supreme leader Ali Khamenei.

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Tehran's hardline mayor and presidential candidate Mahmoud Ahmadinejad looks confident as he clenches his fist after leaving the polling station.

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Akbar Hashemi Rafsanjani, the more moderate candidate, is seen as a pragmatic conservative who nurtures ties with the West.

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A little girl helps her mother place her ballot paper into a box at a Tehran polling station.

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Outgoing reformist President Mohammad Khatami waves to reporters after voting.

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Regardless of who wins, real power in Iran lies with the supreme leader, Ayatollah Ali Khamenei.

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Here, an Iranian woman casts her ballot at her country's consulate in Iraq's capital Baghdad.