Iranian police surrounded the Tehran University attempting to prevent protests of opposition supporters.

On Monday annual state-organized demonstration is held in commemoration of three students killed in anti-American protest 1953 on the Students Day.

Opposition leader Mir Hossein Mousavi supported the demonstrations. He posted the appropriate statement on his website, The New York Times reports.

Iranian authorities fear the protest actions can turn into demonstration against the President Ahmadinejad. Iranian government also blocked internet in the country and banned foreign media from participation in the rally.