China's police kept a tight watch on surviving families of the Tiananmen Square massacre in Beijing on Monday, marking the 29th anniversary of the military crackdown on a student-led pro-democracy protest that remains a taboo in China, Hong Kong media reported.A handful of members of Tiananmen Mothers, a group formed by parents of students killed in the bloody crackdown who have been calling for a redress and accountability for those responsible, gathered at the Wan'an Public Cemetery, 15 kilometers west of Beijing, to mourn the loss of their loved ones.Plain-clothed police officers were wa…READ FULL ARTICLE