Tiananmen Square: What happened in the protests of 1989?

Thirty years ago, Beijing's Tiananmen Square became the focus for large-scale protests, which were crushed by China's Communist rulers. The events produced one of the most iconic photos of the 20th Century - a lone protester standing in front of a line of army tanks. What led up to the events? Video by: Zichen Tsui, BBC Chinese Please subscribe HERE