**Iranian students have interrupted a speech by President Mohammad Khatami to mark Student Day at Tehran university. **
Students chanted “Shame on you” and “Where are your promised freedoms?” to express their frustration with the failure of Iran’s reform movement.
A visibly-shaken Khatami defended his record and criticised the powerful hardliners who have closed newspapers and jailed dissidents.
He asked students to stop heckling and accused his critics of intolerance. Students were once some of President Khatami’s strongest supporters.