University students shout slogans during a sit-down demonstration demanding a stop to the planned Korea-US joint military exercise at a street in central Seoul August 15, 2011, on the day which commemorates the 66th anniversary of Korea's liberation from Japan's 1910-45 colonial rules.Thousands of protesters including university students, unionised workers and civic group members demanded at the pro-unification and anti-war rally that Republic of Korea conclude a peace treaty with Democratic People's Pepublic of Korea. [Photo/Agencies]