BBC: A rare anti-government demonstration has been held in the Iranian capital during a speech at Tehran University by President Mahmoud Ahmadinejad.
There were scuffles as hundreds of supporters and opponents of the president gathered outside the venue.
Eyewitnesses said police used tear gas to hold the demonstrators back.
Student leaders had challenged Mr Ahmadinejad to meet them after he spoke at Columbia University in the US of the freedoms enjoyed by Iranian students.
The BBC's Jon Leyne in Tehran says all gates to the university were locked and journalists were prevented from entering. Iran president faces rare protest (more)
NZZ: Ahmadinejad in Teheran als Diktator beschimpft: Demonstration bei Rede an der Universität
THE TELEGRAPH: Iranian students attack 'fascist Ahmadinejad'
Mark Alexander
