At least 10 people were killed in Tehran on Saturday as police clashed with "terrorists" in protests over a disputed poll, Iranian state TV says.
State media also said family members of Akbar Hashemi Rafsanjani - a powerful opponent of the re-elected president - were arrested during the protests.
Defeated candidate Mir Hossein Mousavi has condemned "mass arrests" of supporters, Reuters news agency says.
Meanwhile Iran has ordered the BBC's Jon Leyne out of the country.
"With regret, we can confirm that Jon Leyne, the BBC's permanent correspondent in Tehran has been asked to leave by the Iranian authorities. The BBC office remains open," a BBC statement said.
Dubai-based Al-Arabiya TV said on Sunday its Tehran office, which was closed by the Iranian authorities a week ago, had been ordered to stay shut indefinitely for "unfair reporting" of the 12 June election.
And Newsweek magazine said its correspondent Maziar Bahari - a Canadian national - was detained without charge on Sunday morning and had not been heard from since.
Campaign group Reporters Without Borders says Iranian authorities have detained 23 local journalists and bloggers since post-election protests began.
The demonstrations were sparked by disputed presidential elections, but have since escalated into Iran's most serious internal conflict since the 1979 Islamic Revolution.
Supreme Leader Ayatollah Ali Khamenei has demanded an end to protest. Witnesses said there did not appear to be any opposition gatherings or demonstrations on Sunday, according to the AFP news agency.
In other developments:
•Iran's most senior dissident cleric Grand Ayatollah Hossein Ali Montazeri calls for three days of national mourning for those killed in street protests, Reuters news agency reports
•Former pro-reform President Mohammad Khatami calls for the release of detained activists
•Iran police chief Gen Esmaeil Ahmadi Moghaddam warns any further unrest will be confronted "decisively"
•Iranian officials again attack the UK for "interfering".
In: Iran, News
Tags: iran election 2009, riots, civilians, fighting, mousavi, ahmadinejad, protests, basiji
Location: Tehran, Tehran, Iran (load item map)
Marked as: approved
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