Students chant slogans at an anti-Japan protest in front of Japanese embassy in Seoul August 11, 2010. Participants at the protest demanded official apology over the issue that Japan systematized so-called comfort women or sex slaves for Japanese soldiers during the World War II, and asked for full compensation for the victims from the Japanese government. Japanese Prime Minister Naoto Kan apologized on Tuesday for Korea's suffering under colonization, despite concern the gesture could reignite calls for wartime compensation. [Agencies]