A witness says supporters of opposition leader Mir Hossein Mousavi are protesting in the capital Teheran for the fourth straight day over the disputed presidential election.
Mousavi called his followers back into the streets of Tehran for another mass rally Thursday, urging them to wear black to mourn those killed in clashes. Mousavi claims Friday's election was rigged in favor of President Mahmoud Ahmadinejad.
The call to rally again was in open defiance of the country's supreme leader, who has urged the nation to unite behind the Islamic state. It came a day after tens of thousands marched silently down a main street of Teheran, brandishing posters of Mousavi and waving V-for-victory signs, amateur video showed. Some covered their mouths with masks.