Long Yan writes,

The corrupt Jiang clique, who plotted to fight for power during the latest party congress, now only care about themselves and their own people. While Hu Jintao, Wen Jiabao and Wu Yi were resisting the disaster,and medical affairs people were fighting the plague without worrying about their personal safety, the Jiang clique kept quiet as this if had nothing to do with them. Only on April 24th when Politbureau member Zeng Qinghong appeared did the Jiang clique's several main members Wu Bang-guo, Jia Qinglin, Li Changchun finally break their silence. However, Jiang Zemin and Huang Ju withdrew to Shanghai, looking for a safe place to hide.

This confirms what John Pomfret says below.