One of the women is said to have died under suspect circumstances last month, despite showing signs of recovery.
The Communist Party's top anti-graft body announced an investigation into Ling Jihua, head of the party's United Front Work Department and a deputy chairman of the CPPCC, on December 22, 2014. Ling had worked for years as the personal secretary of former President Hu Jintao and chief of the Party's General Office. Ling's expected rise to the Polituro was thwarted in 2012 after his son Ling Gu died in a scandalous car crash in Beijing. He became one of the highest-ranking party officials to fall in president Xi Jinping's anti-corruption campaign since latest 2012.