Early results from Iran's presidential election put the reformist-backed candidate, Hassan Rouhani, in the lead.
Official figures give him just over half the 16 million votes
counted so far - well ahead of second-placed Tehran mayor Mohammad
Baqer Qalibaf.Mr Rouhani could win in the first round if he finishes with more than 50%.
Electoral officials said turnout was high among the 50 million Iranians eligible to vote on Friday for a successor to Mahmoud Ahmadinejad.
His eight years in power have been characterised by economic turmoil and Western sanctions against Iran over its nuclear programme.
Surge of support Final results are expected later in the day.
Preliminary figures began to emerge early on Saturday after a delay of several hours.
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Iranian presidential elections

- Six candidates running
- Race is seen as contest between Ayatollah Ali Khamenei loyalists and moderate reformers
- Early lead taken by Hassan Rouhani, a cleric described as a moderate who is backed by two ex-presidents
- Nuclear negotiator Saeed Jalili, said to be very close to Mr Khamenei, lies in fourth place
- About 50 million people were eligible to vote; turnout put at around 80%
- If no candidate wins more than 50%, run-off held on 21 June
Officials at the election
headquarters said that with more than 16,716,937 votes counted so far
- 16,166,392 of them being valid:
- Hassan Rouhani has 8,439,530
- Mr Qalibaf is in second place with 2,560,383
- Mohsen Rezai lies third with 2,101,330, followed by Saeed Jalili on 1,890,462.
Voting was extended on Friday evening to allow more people to cast their ballots. Iranian Press TV said turnout was 80%.
Although all six candidates are seen as conservatives, analysts say Mr Rouhani - a 64-year-old cleric often described as "moderate" who has held several parliamentary posts and served as chief nuclear negotiator - has been reaching out to reformists in recent days.
The surge of support for him came after Mohammad Reza Aref, the only reformist candidate in the race, announced on Tuesday that he was withdrawing on the advice of pro-reform ex-President Mohammad Khatami.
Mr Rouhani thus went into polling day with the endorsement of two ex-presidents - Mr Khatami and Akbar Hashemi Rafsanjani, who was disqualified from the race by the powerful Guardian Council, a 12-member body of theologians and jurists.
However, Mr Rouhani faced a tough challenge from hardline candidates, including Mr Qalibaf - who is seen as a pragmatic conservative - and nuclear negotiator Saeed Jalili - who is said to be very close to the Supreme Leader, Ayatollah Ali Khamenei.
The other three candidates are Mohsen Rezai, a former head of the powerful Revolutionary Guards, former Foreign Minister Ali Akbar Velayati, and former Telecommunications Minister Mohammad Gharazi.
Earlier, Interior Minister Mostafa Mohammad Najjar told state TV that any presidential candidates unhappy with the results would have three days to lodge complaints to the Guardian Council.
'Intimidation' After the last presidential election in June 2009, millions of Iranians took to the streets to demand a re-run, when the supreme leader dismissed claims by the three defeated candidates of widespread fraud.
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Iranian press reaction
- Jomhuri-ye Eslami (hardline): The significant turnout conveyed a few messages. Firstly, the foreign enemy should realise that Iran's domestic conflicts and challenges can never prevent people from voting.
- Khorasan (conservative): The high turnout has enhanced Iran's image and strategic credibility.
- Etemad (reformist) : This election can be considered as one of the most effective and at the same time the most sensitive to have been held in the 34 years since the Islamic Revolution.
- Resalat (conservative): The government that will be formed by the epic vote of the people should stand against the excessive demands of the West.
Two of them, former Prime
Minister Mir Hussein Mousavi and senior cleric Mehdi Karroubi, became
leaders of a nationwide opposition known as the Green Movement, after
its signature colour.
They were placed under house arrested in February 2011 when
they applied to stage a protest in support of the anti-government
uprisings which were sweeping the Arab world. They are still being
detained.No foreign observers monitored this year's election and there have also been concerns that media coverage in the run-up has been unfair.
Many reformist newspapers have been shut down, access to the internet and foreign broadcasters has been restricted, and journalists have been detained.
On Thursday, the BBC accused the Iranian authorities of "unprecedented levels of intimidation" of BBC employees' families.
It said Iran had warned the families of 15 BBC Persian Service staff that they must stop working for the BBC or their lives in London would be endangered.
Tehran has so far made no comment on the allegation