Huge crowds are gathering in central Tehran for another protest against Iran's presidential election result, while the country's powerful Council of Guardians seeks a dialogue with defeated candidates.
Defeated reformist candidate Mir Hossein Mousavi called on his supporters to
gather Thursday and wear black to mourn those killed in post-election violence.
Witnesses say opposition activists have packed Tehran's Imam Khomeini square, in growing demonstrations triggered by the re-election of President Mahmoud Ahmadinejad.
Iran's authorities are trying to block foreign media coverage of the demonstrations, so news organizations have relied heavily on accounts and images sent by Iranian citizens using social media networks including Twitter, Facebook and YouTube.
Wednesday, tens of thousands of people marched silently in Tehran, many wearing green - Mr. Mousavi's campaign color.
Opposition members arrested
Rights groups say numerous opposition members have been arrested in recent days. That includes Ebrahim Yazdi, the general secretary of the banned Freedom Movement Party, who was arrested while in intensive care at a hospital in Tehran.
Mr. Mousavi posted a letter on his Web site in which he and former reformist President Mohammad Khatami urge Iranian authorities to release those detained and end the violence against their supporters.
Iran's Supreme Leader, Ayatollah Ali Khamenei, has called for national unity and is due to lead Friday prayers in Tehran. The occasion is expected to be used as a show of strength for President Ahmadinejad's supporters.
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