Thousands of angry protesters have clashed with police after President Mahmoud Ahmadinejad was declared the winner of Iran's presidential poll.
Secret police have been attacked, while riot police used batons and tear gas against backers of Mir Hossein Mousavi, who called the results a "charade". Correspondents say the violence is the worst seen in Tehran in a decade.
In a televised address to the nation, Mr Ahmadinejad thanked voters for giving him a "great victory". He said the election had been "completely free".