Coverage of Iranian election/news

BBC Persian coverage of the election, etc.
There is a huge rally in Tehran that they are covering right now. Some sources saying hundreds of thousands, all businesses closed, police at a loss for response, but starting to turn people away.
Riot police in vehicles, beating people, speaking Arabic. Strange for sure. Some claims of Pakistani police?
I'm watching the BBC Persian site for footage and following the tweets for english-translated highlights of what's on the news.

Leaked results show election results favored Mousavi. Ahmadi in third.