There are reports of another brutal crackdown in Iran, with websites, internet bloggers and eyewitnesses all talking of a bloodbath in Tehran.

The reports suggest thousands of police and pro-government militia have used firearms, clubs and teargas to suppress another opposition rally.

There is even one account of a nine-year-old girl being shot.

One eyewitness reported riot police beating people, "even police beating women".

"Lots of reports of heavy gunfire and clashes in Baharestan. One guy is calling it a massacre," one says.

"We heard the women are being beaten so badly they have to amputate their limbs," another says.

"We saw militia with axe chopping people like meat - blood everywhere - like butcher."

"The most disturbing are reports of a nine-year-old girl being shot @ Baharestan and the basij [militia] won't let people near her to help."

"Many people have been beaten and injured at the protests across Tehran today," the website says.