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'Mass opposition rally' in Tehran 'Mass opposition rally' in Tehran
(10 minutes later)
Iranian opposition supporters are staging a mass rally in northern Tehran, witnesses have told the BBC.Iranian opposition supporters are staging a mass rally in northern Tehran, witnesses have told the BBC.
It comes despite presidential candidate Mir Hossein Mousavi urging supporters not to risk clashes with demonstrators backing President Mahmoud Ahmadinejad.It comes despite presidential candidate Mir Hossein Mousavi urging supporters not to risk clashes with demonstrators backing President Mahmoud Ahmadinejad.
Hundreds of thousands turned up on Monday alleging fraud in the poll which returned Mr Ahmadinejad to office.Hundreds of thousands turned up on Monday alleging fraud in the poll which returned Mr Ahmadinejad to office.
Tough new restrictions on the foreign media mean the BBC is unable to confirm reports of Tuesday's opposition rally.Tough new restrictions on the foreign media mean the BBC is unable to confirm reports of Tuesday's opposition rally.
The new restrictions have been imposed amid apparent surprise and concern among authorities at the scale of popular defiance over Friday's official election results.
Correspondents say crowds the size of those at Monday's opposition rally have not been seen in Tehran since the 1979 revolution.
An eyewitness told the BBC Tuesday's rally was even bigger than Monday's - though this cannot be independently confirmed.
It is being held in northern Tehran - an opposition stronghold.
Thousands of supporters of President Ahmadinejad staged their own rally in Vali Asr Square in central Tehran - some busses in from the provinces, correspondents say.
The latest opposition rally comes despite a Mousavi spokesman urging supporters not to take part in another demonstration on Tuesday, amid fears of new violence.
Hospital officials say eight people died in violence which erupted at the end of rally - which authorities blamed on "thugs".