UPDATE: 4/25/2012, 11.00 a.m. The 12th paragraph has been updated.

The growing scandal surrounding the ouster of Chongqing Communist Party secretary Bo Xilai has been called the biggest political crisis to hit China since the Tiananmen Square crackdown in 1989. It could also lead to the biggest criminal trial in the country since the Gang of Four appeared in the dock in 1981.