More mass protests are expected in the Iranian capital after presidential challenger Mir Hossein Mousavi urged followers to observe a day of mourning.
Mr Mousavi called on supporters to stage peaceful protests or gather at mosques in memory of eight people killed after a Tehran rally on Monday.
Footage filmed on 17 June, shows protesters gathered in Tehran.
Heavy restrictions have now been placed on the BBC and other foreign news organisations. Reporters are not allowed to cover unauthorised gatherings or move around freely in Tehran, but there are no controls over what they can say. Jon Leyne reports from Tehran.
One-Minute World News 
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