Iran’s supreme leader addressed the nation today in his first public comments since opposition supporters flooded Tehran’s streets in an unprecedented challenge to the country’s ruling clerics.

Tens of thousands of black-clad protesters filled the streets of Tehran again today, joining opposition leader Mir Hossein Mousavi to mourn demonstrators killed in clashes over Iran’s disputed election.

Supporters of opposition leader Mir Hossein Mousavi are protesting in the capital Tehran for the fourth straight day over the disputed Iran presidential election.