TEHRAN — Pressing their claim to victory, pro-government supporters staged a mass rally in Tehran on Tuesday, responding to calls from state media to come out in support of President Mahmoud Ahmadinejad and against protesters they described as "looters and arsonists."
But Ahmadinejad's opponents defied and outwitted authorities to organize another mass rally of their own. Filing silently through the city's main boulevard, they held flowers and green banners, ribbons and posters of Mir-Hossein Mousavi, the former prime minister who lost his bid for the presidency Friday in a vote marred by allegations of fraud.
The dueling rallies illustrated efforts by both sides to seek the stamp of legitimacy by drawing huge numbers of people onto the streets. They also highlighted the contrast between Mousavi supporters' technical savvy and the old guard's blunt instruments of state.
The disputed presidential election results, which Mousavi and his supporters say were forged, have sparked four days of civil unrest, the most momentous since the student uprisings of 1999.
The country's Guardian Council, a 12-man committee that serves to uphold the constitution, announced Tuesday that it had begun a 10-day investigation into allegations of voting irregularities, but also praised the election process and said the reevaluation would be limited to specific areas where alleged infractions took place.
"From the point of view of violations, it was an election that had the least amount of violations reported," said Abbas-Ali Kadkhodai, a spokesman for the council, according to state television.
The country's supreme leader, Ayatollah Ali Khamenei, beseeched Iranians to draw back from the divisions created over the election. At least 12 people have been killed in clashes between pro-government militias and protesters in the capital of 12 million. One was shot and wounded after an altercation at the end of Tuesday's largely peaceful north Tehran rally, according to a witness. A source inside the capital's Evin Prison said upward of 1,500 people, mostly young men, have been arrested during the clashes and roughed up in prison before being let go with warnings.
Among dissidents reported arrested Tuesday were Mohammad Ali Abtahi, a prominent reformist cleric and blogger, and Abdolfattah Soltani, a human rights lawyer.
"Assuming that there are 24 million people on one side and 14 million people on the other side is a big mistake," Khamenei was quoted as saying by state television in reference to the official vote totals. "This is because those who voted for the elected president and other candidates all equally believe in [the] Islamic system."
The pillars of the establishment appeared to be rallying behind Ahmadinejad, who spent much of the day in Russia, where he appeared with Russian President Dmitry Medvedev on his first international trip since his reelection.
Parliamentary speaker Ali Larijani, a prominent conservative, is a rival of Ahmadinejad but, nevertheless, appeared on television addressing lawmakers and urging the nation to get behind the president. He blamed foreigners for the recent days of unrest.
Meanwhile, Ayatollah Hossein Ali Montazeri, Iran's leading dissident cleric, who is closely monitored by authorities in his home in the shrine city of Qom, issued a statement calling for three days of mourning starting today to commemorate the deaths of those killed in the clashes.
The supreme leader's brother, reformist cleric Hadi Khamenei, called for an impartial, independent commission made up of representatives from numerous branches of government and all the opposition candidates, according to the Mehr news agency.
Western reporters have been asked to stay away from unauthorized protests. Official news sources offer little information about unrest elsewhere in Iran, a nation of 70 million.
Protesters have uploaded video to YouTube purporting to show unauthorized demonstrations against the election results and Ahmadinejad in Esfahan, Shiraz, Tabriz and other cities.
Tuesday's two main rallies illustrated both the dynamic political jostling underway in Iran as well as the contrasts between the two camps.
Mousavi had called for a demonstration at 5 p.m. in Tehran's Vali Asr Square, but pro-government loyalists outmaneuvered him, calling for a massive 4 p.m. rally at the same location. Television stations began heavily promoting the pro-government rally on state-controlled TV and radio, urging Ahmadinejad supporters to show up in force as a display of popular support for the president and against "looters and arsonists."
Mousavi, who attended the Monday rally at Azadi (Freedom) Square, but who one source said remains under security restrictions, sought to cancel the rally and called upon his supporters to stay away.