This news from Iran: Riot police wielding batons broke up a protest today in Iran by thousands of students demonstrating in support of Tehran’s detained mayor. Fistfights erupted between supporters of Mayor Gholamhossein Karbaschi and his opponents outside Tehran University, and a few of the protesters were arrested. About 300 riot policemen closed off streets near the university, where 4,000 students were protesting, and then charged the demonstrators. Karbaschi’s arrest has turned into a showdown between supporters of President Mohammad Khatami and his powerful, hard-line opponents inside Iran’s government.