Anywhere between 1000 and 3000 demonstrators have gathered Saturday in the area of the Tehran University, the Bulgarian BTA reports citing AFP.

Iranian police at Enghelab (Liberty) Square have used water cannon, batons and tear gas to disperse protests over the reelection of Mahmoud Ahmadinejad as President of Iran, witnesses in Tehran say.

The rally is held despite earlier police warnings.

A BBC correspondent at Enghelab Square is further quoted as saying there was a huge security operation, including military police, anti-riot police and Basij militia.

Two Iranian news agencies, including Iranian State Television, reported that a suicide bomber died and two people were injured in the bombing near the shrine of Ayatollah Khomeini, leader of the 1979 revolution.

The demonstrators at Enghelab chanted "Death to the dictator" and "Death to dictatorship".

AP, on its part, is citing witness reports that up to 60 were seriously beaten by police, with some being dragged away by fellow protesters.

Helicopters and sirens could be heard over central Tehran, and black smoke seen, AP further informs.

The country's supreme leader Ayatollah Khamenei had warned protesters a day earlier not to continue their rallies, but correspondents say the warning appears to have made some protesters more determined.

BBC points out that none of the reports could be independently confirmed because foreign news organizations have been subjected to strict controls which prevent reporters from leaving their offices.

It is also unclear if defeated candidate Mir Hossein Mousavi is part of the Saturday rally.

Official results of the 12 June presidential poll gave President Mahmoud Ahmadinejad a resounding 63% of votes, compared to 34% for his nearest rival, Mir Hossein Mousavi.

The result has triggered almost daily street protests. The human-rights group Amnesty International says it believes about 10 people have been killed.

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