Just two weeks after being confronted by students at New York’s Columbia University, Iran’s president Mahmoud Ahmadi-Nejad faced a smaller protest much closer to home on Monday – at Tehran University.

More than 100 students gathered to chant slogans – some allegedly deriding Mr Ahmadi-Nejad as a “dictator” – on his arrival at the university and clashed with supporters of the president. Riot police prevented them spreading into neighbouring streets.