TEHRAN, Iran – Tens of thousands of supporters of pro-reform leader Mir Hossein Mousavi are streaming through the center of Tehran in a boisterous protest against election results that declared President Mamoud Ahmadinejad the winner.
The crowd — many wearing the trademark green color of Mousavi's campaign — was headed toward the capital's huge Freedom Square in the largest display of opposition unity since Friday's elections ended with Mousavi claiming widespread fraud.
There was no sign of violence or challenges from security forces. Anti-riot stood by with their helmets off and shields at their sides. '
The march Monday came hours of Iran's supreme leader, Ayatollah Ali Khamenei, ordering an examination into Mousavi's claims of vote rigging. But it was unclear how the investigation will proceed.
THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.
TEHRAN, Iran (AP) — Iran's supreme leader ordered Monday an investigation into allegations of election fraud, marking a stunning turnaround by the country's most powerful figure and offering hope to opposition forces who have waged street clashes to protest the re-election of President Mahmoud Ahmadinejad.
State television quoted Ayatollah Ali Khamenei directing a high-level clerical panel, the Guardian Council, to look into charges by pro-reform candidate Mir Hossein Mousavi, who has said he is the rightful winner of Friday's presidential election.
The decision comes after Mousavi wrote a letter appealing to the Guardian Council and met Sunday with Khamenei, who holds almost limitless power over Iranian affairs. Such an election probe by the 12-member council is uncharted territory and it not immediately clear how it would proceed or how long it would take.
Election results must be authorized by the council, composed of clerics closely allied with the unelected supreme leader. All three of Ahmadinejad's challengers in the election — Mousavi and two others — have made public allegations of fraud after results showed the president winning by a 2-to-1 margin.
"Issues must be pursued through a legal channel," state TV quoted Khamenei as saying. The supreme leader said he has "insisted that the Guardian Council carefully probe this letter."
The day after the election, Khamenei urged the nation to unite behind Ahmadinejad and called the result a "divine assessment."
The results touched off three days of clashes — the worst unrest in Tehran in a decade. Protesters set fires and battled anti-riot police, including a clash overnight at Tehran University after 3,000 students gathered to oppose the election results.
One of Mousavi's Web sites said a student protester was killed early Monday during clashes with plainclothes hard-liners in Shiraz, southern Iran. But there was no independent confirmation of the report. There also have been unconfirmed reports of unrest breaking out in other cities across Iran.
Security forces also have struck back with targeted arrests of pro-reform activists and blocks on text messaging and pro-Mousavi Web sites used to rally his supporters.
A top Mousavi aide, Ali Reza Adeli, told The Associated Press that a rally planned for later Monday was delayed. Iran's Interior Ministry rejected a request from Mousavi to hold the rally and warned any defiance would be "illegal," state radio said.
But one of Mousavi's Web sites still accessible in Iran said Mousavi and another candidate, Mahdi Karroubi, planned to walk through Tehran streets to appeal for calm. A third candidate, the conservative Mohsen Rezaei, has also alleged irregularities in the voting.
State TV quoted Khamenei urging Mousavi to try to keep the violence from escalating and saying "it is necessary that activities are done with dignity."
Mousavi, who served as prime minister during the 1980s, has also threatened to hold a sit-in protest at the mausoleum of the late Ayatollah Ruhollah Khomeini, founder of the 1979 Islamic Revolution. Such an act would place authorities in a difficult spot: embarrassed by a demonstration at the sprawling shrine south of Tehran, but possibly unwilling to risk clashes at the hallowed site.
Overnight, police and hard-line militia stormed the campus at the city's biggest university, ransacking dormitories and arresting dozens of students angry over what they say was mass election fraud.
The nighttime gathering of about 3,000 students at dormitories of Tehran University started with students chanting "Death to the dictator." But it quickly erupted into clashes as students threw rocks and Molotov cocktails at police, who fought back with tear gas and plastic bullets, a 25-year-old student who witnessed the fighting told The Associated Press. He would only give one name, Akbar, out of fears for his safety.
The students set a truck and other vehicles on fire and hurled stones and bricks at the police, he said. Hard-line militia volunteers loyal to the Revolutionary Guard stormed the dormitories, ransacking student rooms and smashing computers and furniture with axes and wooden sticks, Akbar said.
Before leaving around 4 a.m., the police took away memory cards and computer software material, Akbar said, adding that dozens of students were arrested.
He said many students suffered bruises, cuts and broken bones in the scuffling and that there was still smoldering garbage on the campus by midmorning but that the situation had calmed down.
"Many students are now leaving to go home to their families, they are scared," he said. "But others are staying. The police and militia say they will be back and arrest any students they see."
"I want to stay because they beat us and we won't retreat," he added.
Tehran University was the site of serious clashes against student-led protests in 1999 and is one of the nerve centers of the pro-reform movement.
After dark Sunday, Ahmadinejad opponents shouted their opposition from Tehran's rooftops. Cries of "Death to the dictator!" and "Allahu Akbar!" — God is great — echoed across the capital. The protest bore deep historic resonance — it was how the leader of the Islamic Revolution Ayatollah Ruhollah Khomeini asked the country to unite against the Western-backed shah 30 years earlier.
Amnesty International criticized Iran Sunday for blocking media and Internet sites. It said on Saturday, access to social networking sites was blocked, as was access to a range of online news services. Many of these outlets carried reports which raised concerns that the conduct of the election was flawed and results had been rigged, Amnesty said.
"Instead of instituting an information clampdown, including by blocking video sharing social networking sites like YouTube and Facebook; along with a handful of online news sites, the authorities should openly address the concerns and criticisms clearly expressed by so many," said Hassiba Hadj Sahraoui, the deputy director of Amnesty's Middle East and North Africa Program.
Amnesty called on Iranian authorities to ensure that newspapers linked to other presidential candidates are permitted to carry the statements of those candidates.
In Moscow, the Iranian Embassy said Ahmadinejad has put off a visit to Russia, and it is unclear whether he will come at all. Ahmadinejad had been expected to travel to the Russian city of Yekaterinburg and meet on Monday with President Dmitry Medvedev on the sidelines of a regional summit.