Iran’s state TV is showing thousands of pro-government demonstrators rallying to mark the anniversary of the 1979 Islamic Revolution.

The opposition has vowed to stage counter demonstrations, but eye-witnesses say police have deployed hundreds of forces in central Tehran to confront them.

Opposition members went on roof tops late Wednesday and shouted “God is greatest” in protest - echoing similar cries after the disputed June election as well as anti-shah protests more than three decades ago.

Since the election that brought President Mahmoud Ahmadinejad to power, opposition protesters have repeatedly taken to the streets.

Thursday’s pro-government rallies in Tehran will end at Azadi square, where the president will address the crowd.

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