[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/images/08/05/art.bush.south.korea.jpg caption="President Bush walks with South Korean Foreign Minister Yoo Myung-Hwan."]
SEOUL, South Korea (CNN) - Thousands of protesters packed the streets of the South Korean capital Tuesday as President Bush arrived for the start of his Asian tour.
While some of the demonstrations were peaceful, violence erupted at other protest sites. In one instance, riot police fired a water cannon to keep the crowds at bay.
Police said they detained about 80 protesters. They estimated about 2,700 people were participating in the protests, which included a candlelight march and a sit-in. But the organizers said some 10,000 were taking part in the demonstrations.
Bush's week long trip to the region is his ninth visit as president. His stop in Seoul comes just a few months after violent street protests erupted over worries about the safety of U.S. beef imports.
While those tensions seem to have eased, the United States' nuclear disarmament deal with North Korea is also a concern.