WISCONSINREPORT.COM (06/15/2009) - Witnesses in Tehran said today a protester has been shot and killed at a massive pro-opposition rally in the Iranian capital. Official election results show Iranian incumbent President Mahmoud Ahmadinejad won 63 percent of the vote, compared to 34 percent for challenger Mir Hossein Mousavi, his main rival. An Iranian photographer on the scene of a protest rally over the election results said that armed members of a pro-government militia opened fire on the crowd today, killing at least one demonstrator.

The incident allegedly took place outside a compound of the Basij militia in Tehran.

The gunfire Monday panicked a crowd of at least 100,000 who were protesting against the results of a disputed presidential election, according to Voice of America News.

Tens of thousands of Iranians flocked to central Tehran to see reformist presidential candidate Mir Hossein Mousavi address the rally in defiance of an official ban.

Mr. Mousavi stood on top of a car to talk through a loudspeaker to the massive crowd of his supporters. The rally flooded the streets of the capital Monday, despite a government warning that the gathering would be illegal.

The protesters chanted for Mr. Mousavi to retrieve their votes from Friday's election. The reformist candidate has accused the government of voter fraud. Official results gave a landslide victory to President Mahmoud Ahmadinejad, with Mr. Mousavi a distant second.

VOA News reports that riot police were on the scene but did not stop the rally.

Supreme Leader Ayatollah Ali Khamenei has asked the powerful Guardian Council of Islamic clerics Monday to investigate allegations of voter fraud. Mr. Mousavi appealed to the Council Sunday to cancel the election results.

President Ahmadinejad says the election was free and fair.

Ayatollah Khamenei initially cheered Mr. Ahmadinejad's apparent landslide victory and urged Iranians to unite behind the president.

Iranian state media say Ayatollah Khamenei urged Mr. Mousavi on Sunday to pursue election complaints through legal means.