Protests at Tehran University against Iran regime

Pro-reform Iranian students march during a protest at the Tehran University campus in Iran, Monday. Photograph: guardian.co.uk

Iranian supporters, left, of defeated presidential candidate Mir Hossein Mousavi clash with supporters, right, of supreme leader Ayatollah Ali Khamenei at Tehran University in the Iranian capital Photograph: guardian.co.uk

Iranian opposition supporters demonstrate at Tehran University in the Iranian capital. Iranian police firing tear gas clashed with crowds of protesters in central Tehran as opposition supporters used Students Day commemorations to stage fresh anti-government demonstrations Photograph: guardian.co.uk

A pro-reform Iranian student beaten by hard-liners during their demonstrations at the Tehran University campus Photograph: guardian.co.uk

Pro-reform Iranian students and hard-line students scuffle during demonstrations at the Tehran University campus in Iran Photograph: guardian.co.uk

An anti-government Iranian female student wearing a green scarf, the symbolic colour of opposition, gestures during a protest at the Tehran University campus Photograph: guardian.co.uk

An Iranian opposition supporter holds a picture of Neda Agha Soltan, who was killed during post-election riots, as he takes part in an anti-government demonstration at Tehran University Photograph: guardian.co.uk

Iranian supporters, left, of defeated presidential candidate Mir Hossein Mousavi stand opposite supporters, right, of supreme leader Ayatollah Ali Khamenei at Tehran University in Iran Photograph: guardian.co.uk

Iranian opposition supporters hold a picture of defeated presidential candidate Mir Hossein Mousavi during an anti-government demonstration at Tehran University Photograph: guardian.co.uk

An Iranian opposition supporter gestures as she takes part in an anti-government demonstration at Tehran University Photograph: guardian.co.uk

An injured Iranian protester receives help during a demonstrations against President Mahmoud Ahmadinejad in Tehran. Police fired tear gas against protestors near Tehran University, trying to quell demonstrations Photograph: Str/guardian.co.uk

Pro-government Iranian students burn a representation of the US flag, during their demonstration at the Tehran University campu Photograph: guardian.co.uk

Student supporters of opposition leader Mir Hossein Mousavi, left, scuffle with pro-government students during protests in central Tehran Photograph: guardian.co.uk

Student supporters of opposition leader Mir Hossein Mousavi hold red roses during protests in central Tehran Photograph: guardian.co.uk

Students show victory signs and red roses during protests in central Tehran Photograph: guardian.co.uk