A woman puts flowers on the protective shields of riot police during a protest Saturday against the fatal beating of a student by police this past week. Tens of thousands of students, workers and dissidents demanded the ouster of President Roh Tae-woo in nationwide protests over the death. About 2,000 marching toward city hall were stopped at a U.S. diplomatic building along the route and driven back by thousands of riot police backed by armored vans and water cannon.