Shots have been fired during a mass rally staged by Mir-Hossein Moussavi supporters, who cry foul over what they call 'vote-rigging' in Iran's presidential election.

PressTV's man-on-the-spot, recording live from the scene, reported that as the protesters were beginning to disperse at sundown after a peaceful rally, unidentified gunmen fired shots into the crowd.

The shooters were reportedly not in uniform.

"There has been sporadic shooting out there ... I can see people running here," said our correspondent, adding that he had seen a wounded boy, being carried.

The rally staged by pro-Moussavi supporters incredulous at the official results of Iran's presidential ballot on Friday, which gave the incumbent president Mahmoud Ahmadinejad a huge 63 percent of the cast votes.

The Monday rally, which went ahead after the Interior Ministry denied the Moussavi camp with permission for a gathering, was the largest in a series of protests since the announcement of results on Saturday.

While Moussavi has backed the right of his supporters to express their dissatisfaction with peaceful protests, he has stressed that they should remain calm and vigilant against provocations.

The rally today was peaceful until the eruption of violence in the evening.

Moussavi has filed a complaint with the election supervising body, the Guardian Council. He has also called for the annulment of the election, asking for a new vote.

Press TV is still receiving news from the scene.