Retired officials under probes since 2013

Guo Yongxiang, 64, former vice-governor of Sichuan province

Retired in January 2013 and probed by the Communist Party of China Central Commission for Discipline Inspection last June.

Expelled from the Party and dismissed from public office.

Transferred to judicial authorities, with all of his illegal gains confiscated in April.

Ni Fake, 60, former vice-governor of Anhui province

Probed by the Party's discipline watchdog in June last year, five months after his retirement.

Transferred to judicial authorities in September.

Chen Baihuai, 64, former vice-chairman of the top political advisory body in Hubei province

Investigated by the Party watchdog in September, eight months after he left his post.

Wang Xiaolin, 67, former director of the urban environment committee of Shanxi provincial people's congress

Expelled from Party organization and transferred to judicial authorities in April, seven years after his retirement.

Source: CPC Central Commission for Discipline Inspection