Campus clashes provide uneasy backdrop to third round of talks on nuclear programme in Geneva

Plainclothes police and security forces, many of them armed, have tried to flood Iran’s remaining open universities in an attempt to crush a fourth day of student protests against the supreme leader, Ali Khamenei.

Running battles were reported on some campuses, with videos showing fistfights between the Basji state-backed militia and students at the University of Science and Technology in Tehran. Pick-up trucks with machine-guns were photographed parked outside the University of Tehran, with demonstrations also in Mashhad.