About 100 radical students battled riot police with firebombs and rocks and burned an effigy of President Bush Friday despite stern warnings against violent anti-government, anti-U.S. protests.

The students from Chungang University fought running battles with police for 40 minutes in front of the Seoul school. They also burned an effigy of President Roh Tae-woo before dispersing.The United National Democratic Movement, an umbrella organization for more than 200 dissident groups, said it is planning major anti-American rallies on Monday, when Bush comes for a five-hour visit.

Bush was in Tokyo for Emperor Hirohito's funeral and is scheduled to stop in Seoul en route to Washington after visiting China. In Seoul, he will meet with Roh and deliver a speech to the National Assembly.