Please turn on JavaScript. Media requires JavaScript to play. Advertisement Iranian police have used water cannon, batons, tear gas and live rounds to break up protests over the presidential election, witnesses in Tehran say. A BBC reporter said he saw one man shot and others injured amid running fights. Defeated candidate Mir Hossein Mousavi repeated calls for the election to be annulled on the grounds it was rigged. US President Barack Obama urged Iran's government "to stop all violent and unjust actions against its own people", saying the "world is watching". TEHRAN EYEWITNESS BBC CORRESPONDENT Security forces were everywhere in central Tehran in the late afternoon and early evening. As I spent a couple of hours driving around in heavy traffic I could see thousands of men, some uniformed members of the military riot squads, some units of revolutionary guard, and everywhere basijis - militiamen who look like street toughs. The security men were deployed on every street corner, in long lines down the sides of the roads, and in all the main squares. The basijis wore riot helmets and carried big clubs. It was designed to intimidate, and while I was there, it was working. BBC eyewitness: Heavy security The country's supreme leader Ayatollah Khamenei had warned protesters on Friday not to continue their rallies, but they openly defied his words. President Obama said the US stood by all who sought to exercise their right to free speech and assembly. He added: "If the Iranian government seeks the respect of the international community, it must respect the dignity of its own people and govern through consent, not coercion." It was unclear if Iranian political leaders had backed their supporters continuing to march. In a letter to the electoral body, the Guardian Council, Mr Mousavi, who had not made a public comment for two days, reiterated his calls for the election to be declared void. He alleged the vote, held on 12 June, was rigged months previously. Official results of the presidential poll gave President Mahmoud Ahmadinejad a resounding 63% of votes, compared to 34% for Mr Mousavi, his nearest rival. In other developments: Thousands of police, militia and secret policemen blocked access to Enghelab and Azadi squares, and protesters were throwing stones in surrounding streets

A BBC correspondent saw one man shot in a crowd and another with injuries from a razor-wielding secret policeman

About 3,000 protesters were reportedly gathered at Enghelab Square, according to Associated Press news agency. They chanted "Death to the dictator" and "Death to dictatorship"

One witness told Reuters news agency that protesters loyal to defeated candidate Mir Hossein Mousavi set fire to a building in southern Tehran used by backers of President Mahmoud Ahmadinejad

A column of black smoke is hanging over the city centre, our correspondent says

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

In pictures: Tehran unrest Q&A: Blocked protests Reporters' log: Iran's upheaval Your reports of protests See map of central Tehran Some reports could not be independently confirmed. Foreign news organisations - including the BBC - have been subjected to strict controls which prevent reporters from leaving their offices. A BBC correspondent in Tehran says his impression is that the police have broken up large crowds into smaller groups to prevent them assembling. Confusing signals Early on Saturday, the wife of Mr Mousavi and an aide to another rival candidate, Mehdi Karroubi, said the rally would go ahead, although this was later contradicted by his party. Speaking on state TV, deputy police chief Ahmad Reza Radan warned police would "certainly fight against any form of illegal gathering and protest". He also said protest organisers would be arrested. The result triggered almost daily street protests - a challenge to ruling authorities unprecedented since the Islamic revolution of 1979. Mr Mousavi had been expected, along with fellow challengers Mr Karroubi and Mohsen Rezai, to discuss more than 600 objections they had filed complaining about the poll at a meeting of the Guardian Council, which certifies elections, on Saturday. But neither Mr Mousavi nor Mr Karroubi attended the meeting - which suggests, our correspondent says, they have abandoned their legal challenge to the election results. State TV quoted the Guardian Council as saying it was "ready" to recount a randomly selected 10% of ballot boxes. It had previously offered a partial recount of disputed ballots from the election, rather than the full re-run of the election demanded by protesters.

Back to story Are you in Iran? What do you think of the current situation? Are you taking part in the demonstrations? If you have any information you would like to share with the BBC you can do so using the form below: Send your pictures and video to yourpics@bbc.co.uk or text them to +44 7725 100 100. If you have a large file you can upload here. Read the terms and conditions At no time should you endanger yourself or others, take any unnecessary risks or infringe any laws.

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