“The officials who were questioned have not been taken into custody, but are barred from leaving the country, said the sources, who requested anonymity to avoid repercussions for discussing secretive elite politics.
“The officials include the country's top prosecutor Cao Jianming and people in the security apparatus - the police force and civilian intelligence agency - that Zhou used to head, they said.
“Several lower-ranking Beijing city government officials as well as anchors of state broadcaster CCTV have also been questioned, the sources said.