A vice mayor in Chengde, north China's Hebei Province, has been added to a list of least nine other officials in the city under investigation for discipline and law violations, the disciplinary watchdog said Tuesday.

Su Aiguo, also a Standing Committee member of the Communist Party of China's (CPC) Chengde City Committee, is suspected of "serious" discipline and law violations, a statement issued by the provincial CPC discipline inspection commission said.

Su, 56, served as vice mayor of Chengde from 2009.

Amid the nationwide campaign to root out corruption, at least nine other officials in Chengde had been put under investigation or penalized this year, including Li Gang, executive vice mayor of the city.