Videos: Iran Riots!

Police in Tehran hit back with tear gas at stone throwing students who took part in a third day of of nationwide protests against government. At least 50 people have arrested since the protests began on Thursday in Mashhad, the country's second-largest city, in what has been the most serious challenge to the Islamic Republic since demonstrations following the disputed 2009 presidential election. There was chaos around the University of Tehran on Saturday as several hundred people scuffled with police and shouted slogans against the regime for several hours, bringing traffic to a standstill. Source