The students had wanted to protest outside their university
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Iranian students say they have been banned from holding a demonstration to support reformist candidates barred from this month's election.
The student news agency, ISNA, quoted the Tehran governor's office as saying no authorisation had been given for a rally planned in the city on Wednesday.
Student protests last year sparked a national security crackdown.
Iran has been embroiled in a three-week row between conservatives and reformists over the 20 February poll.
Request denied
The Tehran University branches of the Islamic Association said they had requested permission to stage a demonstration outside the main campus.
But Ali Taala, director of political and security affairs for the city, was quoted as telling the students: "No gathering will be allowed outside the entrance of Tehran University."
Correspondents say students are often seen as a driving force behind the reformist movement.
Last week, the main pro-democracy student movement, the Office to Consolidate Unity, OCU, called for a national boycott of the elections from which thousands of candidates have been banned by the conservative Guardians Council.
The students also called for a referendum on the country's political future.
But Foreign Minister Kamal Kharrazi said on Tuesday that he hopes the controversy will be resolved to allow free and fair elections.
Speaking during a visit to Ukraine, Mr Kharrazi said Iran was following a path of democratic change.