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Zhang Xianling whose late son, Wang Nan was killed in the 1989 Tiananmen Square crackdown speaks during an interview ahead of the June 4 anniversary in Beijing, China, Monday, May 28, 2012. Zhang said her friend Ya Weilin, a father of a man killed in the 1989 crackdown had committed suicide on Friday, May 25, 2012 out of despair and to protest the government's long-standing refusal to address the grievances of the victims' relatives. (AP Photo/Ng Han Guan)

Zhang Xianling whose late son, Wang Nan was killed in the 1989 Tiananmen Square crackdown speaks during an interview ahead of the June 4 anniversary in Beijing, China, Monday, May 28, 2012. Zhang said her friend Ya Weilin, a father of a man killed in the 1989 crackdown had committed suicide on Friday, May 25, 2012 out of despair and to protest the government's long-standing refusal to address the grievances of the victims' relatives. (AP Photo/Ng Han Guan)

China cracks down on Tiananmen anniversary

Chinese authorities have rounded up hundreds of activists in the capital Beijing, rights campaigners said on June 4, as they marked the 23rd anniversary of the Tiananmen Square crackdown.