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A group of college students shout slogans to denounce what they claim is illegal surveillance of students critical of the government by police, during a rally in front of the National Police Agency (NPA) in Seoul, Monday. They demanded an apology and explanations from NPA Commissioner Kang Sin-myeong for recent crackdowns on protests at Sogang, Sungkonghoe and Cheongju universities. / Yonhap