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In the clip, likely shot from a cell phone, a blue-shirted gunman fires an AK-47 into a courtyard from a second-story window.
In the foreground, a crowd of protesters shouts slogans as dozens of shots ring out. The gunman and his targets are behind a high wall, so the crowd doesn't move.
The footage broadly matches an incident that took place Monday evening in Tehran, as young protesters broke into a compound used by the Basij paramilitary force. Seven were reported killed as Basij members fired upon them.
"Marg bar Basiji" — "Death to Basij members" — reads a comment attached to the video clip.
Since hardline President Mahmoud Ahmadinejad took office in 2005, the Basij has grown in numbers and influence, and it is directly controlled by the Revolutionary Guards, Iran's ideologically pure parallel military.
"'One shot dead' at Iran protest"
At least one person has been killed in Tehran after armed men opened fire during a rally by tens of thousands of people protesting against Iran's election results.
"It's extraordinary to me that anyone would start shooting at such a huge crowd of people," he said.
"Especially people who have been continuously non-violent all the way from the start of this march, which has of course been prohibited so I suppose that will be the excuse."
Ebrahim Yazdi, the leader of the banned opposition Freedom Movement, said Ahmadinejad's attacks on his opponents had opened a "Pandora's box" which had led to a deep crisis within the Islamic state's establishment.
"The result of such a crisis now is that the rift among the ... personalities in the revolution is getting deeper," he said.
"It is also between people and their government ... a rift between state and the nation. It is the biggest crisis since the  revolution."