Students marched through Seoul on Sunday, protesting against the U.S. military presence there and the Americans' hostile attitude toward North Korea.
Police and witnesses said more than 10 people were injured as students clashed with riot police on Sunday and dozens were arrested.
Demonstrators paraded through the capital, before attempting to enter the Yongsan U.S. military base in the city's centre.
Another crowd gathered near the U.S. Embassy, calling for talks with diplomatic staff.
Reports of the size of the demonstrations varied widely, from about 1,000 to 15,000 people.
The students were upset by the U.S. government's hard-line attitude toward North Korea, especially in recent negotiations over Pyongyang's nuclear program.
The demonstrators also demanded the United States withdraw the 32,000 troops it has stationed in South Korea.
The Americans have maintained a military presence in the country since the 1950-53 Korean War.
The contingent is to drop to about 24,500 troops within a few years, in part because several thousand troops have been reassigned to Iraq.
CBC News
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