It seems that cancelling the protests was not enough for Iranian students to avoid a confrontation with the opponents of democracy.
At the end of a news conference to explain the cancelling of the planned demonstrations three student leaders were kidnapped by Islamic vigilantes. Report here.
Update: The Teheran Times/Mehr News Agency say that the three students were arrested.
Meanwhile there have been some clashes and the weblog Tehran Online says explosions have been heard near the University.