TEHRAN, Iran - Gunfire from a pro-government militia killed one man and wounded several others Monday after hundreds of thousands of chanting opponents of President Mahmoud Ahmadinejad marched in central Tehran to support their pro-reform leader in his first public appearance since disputed elections.
The outpouring in Azadi, or Freedom, Square for reformist leader Mir Hossein Mousavi followed a decision byIran's most powerful figure for an investigation into the vote-rigging allegations.
Security forces watched quietly, with shields and batons at their sides.
Later, a group of demonstrators with fuel canisters set a small fire at a compound of a volunteer militia linked toIran's powerful Revolutionary Guard as the crowd dispersed from the square. As some tried to storm the building,people on the roof could be seen firing directly at the demonstrators at the northern edge of the square, awayfrom the heart of the rally. An Associated Press photographer saw one person fatally shot and at least two others who appeared to beseriously wounded. The United States was "deeply troubled" by reports of violence and arrests in Iran, State Departmentspokesman Ian Kelly said, but he added that the U.S. knows too little about the conduct of the election to say forsure whether there was fraud. The chanting demonstrators had defied an Interior Ministry ban and streamed into central Tehran -- anoutpouring for Mousavi that swelled as more poured from buildings and side streets. The crowd -- many wearing the trademark green color of Mousavi's campaign -- was more than five miles (ninekilometers) long, and based on previous demonstrations in the square and surrounding streets, its size wasestimated to be in the hundreds of thousands.
"I am ready to pay any price to materialize the ideals of you dear people," he said, speaking though a portableloudspeaker.
"People feel their wisdom has been insulted. We have to pursue legal channels to regain our trampled rights andstop this last lie, and stand up to fraud and this astonishing charade." Mousavi, wearing a gray striped shirt, saidhis solution was "canceling the result of this disputed election." "This will have the least cost for our nation.Otherwise, nothing will remain of people's trust in the government and ruling system." The crowd roared back:"Long live Mousavi." One placard said, in English: "This is not election. This is selection." Other marchers heldsigns proclaiming "We want our vote!" and they raised their fingers in a V-for-victory salute.
"We want our president, not the one who was forced on us," said 28-year-old Sara, who gave only her first namebecause she feared reprisal from authorities.
As darkness fell, cries of "Allahu akbar!" -- "God is great!" -- were heard across central Tehran as peoplegathered on rooftops for a second straight night. On Sunday night, Ahmadinejad opponents shouted "Death to thedictator!" The protest bore deep historic resonance -- it was how the leader of the Islamic Revolution Ayatollah
Ruhollah Khomeini asked Iran to unite against the Western-backed shah 30 years earlier.
Elsewhere in Iran, witnesses saw hundreds of Mousavi supporters gathered in the heart of the central city ofEsfahan. Some broke windows of police stations and buildings belonging to the government's RevolutionaryCourts, tribunals designated for crimes against the principles of the Islamic ruling system.
Thousands gathered at a university in the northeastern city of Mashhad, witnesses told the AP by phone. Inother parts of the town, generally seen as more conservative than Tehran, there were scattered gatherings, andpolice with batons beat demonstrators.
Police in the southern city of Shiraz fired in the air to disperse several pro-Mousavi gatherings. Police Gen. AliMoayeri of the Fars Province police told reporters that officers had been "authorized to shoot. From now on wewill respond harshly." One of Mousavi's Web sites said a student protester was killed early Monday in clasheswith plainclothes hard-liners in Shiraz.
In the heavily Arab city of Ahvaz near the Iraqi border, about 2,000 people chanted, "We don't want a dictator!"Police attacked some of them with batons.
Most media are not allowed to travel beyond Tehran and thus can not independently confirm protestselsewhere.
Earlier Monday, Supreme Leader Ayatollah Ali Khamenei directed one of Iran's most influential bodies, theGuardian Council, to examine the election claims. But the move by Khamenei -- who had earlier welcomed theelection results -- had no guarantee it would satisfy those challenging Ahmadinejad's re-election or quell days ofrioting after Friday's election that left parts of Tehran scarred by flames and shattered store fronts.
The 12-member Guardian Council, made up of clerics and experts in Islamic law and closely allied to Khamenei,must certify ballot results and has the apparent authority to nullify an election. But it would be an unprecedentedstep. Claims of voting irregularities went to the council after Ahmadinejad's upset victory in 2005, but there wasno official word on the outcome of the inquiry, and the vote stood.
More likely, the dramatic intervention by Khamenei could buy time in hopes of reducing the anti-Ahmadinejadanger. The prospect of spiraling protests and clashes is the ultimate nightmare for the Islamic establishment,which could be forced into back-and-forth confrontations and risks having the dissidents move past the electedofficials and directly target the ruling theocracy.
Government shootings of protesters before the Islamic Revolution set up a cycle of violence in which the shah'sforces opened fire on demonstrators massing to mourn "martyrs" at the end of the 40-day Muslim mourningperiod. Forty days later, demonstrators gathered again, there were new shootings, and the cycle continued.
Monday's massive display of opposition unity suggested a possible shift in tactics by authorities after crackingdown hard on days of rioting. Although rallies were outlawed earlier, security forces were not ordered to moveagainst the protesters.
State TV quoted Khamenei as ordering the Guardian Council to "carefully probe" the allegations of fraud, whichwere contained in a letter Mousavi submitted Sunday.
On Saturday, however, Khamenei urged the nation to unite behind Ahmadinejad and called the result a "divineassessment." The results touched off three days of the worst unrest in Tehran in a decade. Protesters set fires andbattled riot police, including a clash overnight at Tehran University after about 3,000 students gathered to opposethe election results.
Security forces have struck back with targeted arrests of pro-reform activists and blocking text messaging andpro-Mousavi Web sites used to rally his supporters.
The unrest risked bringing splits among Iran's clerical elite, including some influential Shiite scholars raisingconcern about possible election irregularities and at least one member of the ruling theocracy, former President
Hashemi Rafsanjani, openly critical of Ahmadinejad in the campaign.
According to a pro-Mousavi Web site, he sent a letter to senior clerics in Qom, Iran's main center of Islamiclearning, to spell out his claims.
The accusations also have brought growing international concern.
On Sunday, Vice President Joe Biden raised questions about whether the vote reflected the wishes of the Iranianpeople.
Britain and Germany joined the calls of alarm over the confrontations. In Paris, the Foreign Ministry summonedthe Iranian ambassador to discuss the allegations of vote tampering and the violence.
Overnight, police and hard-line militia stormed Tehran University, ransacking dormitories and arresting dozensof students. The university was the site of serious clashes against student-led protests in 1999 and is one of thenerve centers of the pro-reform movement.
The gathering at the university started with students chanting "Death to the dictator." But it quickly eruptedinto clashes as students threw rocks and Molotov cocktails at police, who fired tear gas and plastic bullets, a25-year-old student who witnessed the fighting told the AP. He would only give one name, Akbar, out of fear forhis safety.
The students set vehicles afire and hurled stones and bricks at the police, he said. Hard-line militia volunteersloyal to the Revolutionary Guard stormed the dormitories, ransacking student rooms and smashing computersand furniture, Akbar said.
Before leaving around 4 a.m., the police took memory cards and computer software material, Akbar said, addingthat dozens of students were arrested.
He said many students suffered bruises, cuts and broken bones in the scuffles.
"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 usand we won't retreat," he added.
In Moscow, the Iranian Embassy said Ahmadinejad postponed his visit to Russia until Tuesday. Ahmadinejadhad been expected to travel to the Russian city of Yekaterinburg and meet on Monday with President DmitryMedvedev on the sidelines of a regional summit.