In Iran, protesters and government forces clash on anniversary of revolution

Today marks the anniversary of the 1979 Iranian Revolution and protesters and government forces clashed on the streets of Tehran and in other cities.

A Youtube video posted today shows crowds of protesters chanting "We're together, don't be afraid.” Suddenly, clouds of red tear gas burst and people begin to flee along the busy street.

Earlier this week, the government shut down parts of the Internet, including Gmail, and blocked some text messaging, which had proved a useful tool to organizers during past protests. Still, reform leaders had publicly called for people to come out into the streets, and despite warnings from the government, it appears that some did. The Associated Press reported a large police presence in central Tehran and plain clothes militia allegedly beat and tried to detain the wife of reform leader Mir Hossein Mousavi.

Meanwhile, President Mahmoud Ahmadinejad spoke today in front of a large crowd at Azadi Square in Tehran. He declared that Iran was now a nuclear state. He said that Iranian scientists had, for the first time, processed uranium to a level of 20 percent enrichment.The US has called for stiff sanctions against Iran and the UN's International Atomic Energy Agency says it is seeking details of Iran's latest claims.

We're joined by Hadi Ghaemi, executive director for the International Campaign for Human Rights in Iran.