Thousands of radical students and dissidents shouting "Unification!" rallied today at a university to demand free travel to Communist North Korea.
Police fired tear gas to disperse the protesters, and several dozen students hurled stones.
There were no injuries or arrests at the protest outside Seoul's Yonsei University, where the 3,000 protesters had gathered in support of unification.
But in a separate incident, seven students were arrested trying to cross Freedom Bridge, a major access to the border. Another five radicals were arrested in downtown Seoul shouting anti-government slogans.